Ui Maine region
- Uí Briúin - Uí Briúin Ai, Uí Briúin Bréifne, Uí Briúin Seóla, et al
- Sil Muiredhaigh - O'Conchobair, the main branches being O'Conor Don, O'Conor Roe and O'Conor Sligo. However,
there were also MacDermots of Moylurg, MacDonaghs of Corran (Tireril), MacManus of north Roscommon (Tír Tuathail,
Kilronan parish), Ó Roduibh (Mac Geraghty) of central Roscommon, Ó Fionnachta (O'Finaghty) of Sil Murray, Ó Flannagain
(O'Flanagan), Mac Dail-re-Deachair (MacDockery) of Sil Murray, O'Beirne, ... From Keatings Genealogies, some of the
septs of Síl Murray included O Flannagain (O'Flanagan), O Maoilbhreanainn (O'Mulrennan), O Maoilmhoicheirghe
(MacDockery?), O Birn (O'Beirne), O Fallamhain (O'Fallon), Mac Shamhradhain (MacGovern), O Coincheanainn
(O'Concannon), Mac Oireachtaigh (MacGeraghty), Mac Diarmada (MacDermot), Mac Maghnusa (MacManus),
O Gealbhuidhe (O'Gilboy?), and O Conchubhair (O'Conor). It should be noted that other genealogies place the
septs of O'Fallon and O'Concannon as part of the Ui Maine of Connacht. The genealogies of MacFirbis mention
O Lachtnain (O'Laughnan) of Siol Muireadhaigh.
- Clan Cathail - chief of Clanconnor, in Castlereagh barony, e.g. Ó Maoilbreannain (Mulrennan);
- Ó Flannagain (O'Flanagan) between Mantua and Elphin.
- Muintir Roduiv - barony of Roscommon, e.g. Ó Roduibh and Mac Aireachtiagh (Mac Geraghty) of Clan Tomaltaigh.
- Clanconway - on both side of the river Suck, e.g. Ó Fionnachta (O'Finaghty or Finnerty) of Clan Murchadha
- Uí Briúin Bréifne - O'Rourke, lords of Bréifne, and O'Reilly, lords of Muinter Maelmordha
- Uí Briúin Seóla - O Flaithbheartach (O'Flaherty) of County Galway
- Clann Cosgraigh - eastern side of Lough Corrib in Galway, e.g. Mac Aedha.
- Uí Ailella - baronies of Tirerril and part of Corran in southeast Co. Sligo MacDonnchadha (MacDonagh) and MacDiarmada
(MacDermot) of Uí Briúin Ai held sway in this area.
- Uí Fiachrach Aidne - co-extensive with the Diocese of Kilmacduagh. Septs included Ó hEidhin (O'Heyne), Ó Cleireach
(O'Cleary), Ó Seachnasach (O'Shaughnessy), Ó Cathail (O'Cahill), Mac Giolla Ceallaigh (Kilkelly)
- Uí Eachach Muaidhe - west of the river Moy, in co. Mayo (e.g. Mulrennin and Milford)
- Uí Fiachrach Muaide - baronies of Erris and Tirawley in Co. Mayo and Tireragh in Co. Sligo, e.g. Ó Dubhda (O'Dowd),
Ó Caithniadh (O'Canny), Ó Cadhain (O'Coyne), Ó Cearnaigh (O'Carney) of Moynulla and Balla, Ó Toghda (O'Towey) of Bredagh,
O'Gaibhtheachain (O'Gaughan) of Calry, the Murrays of Lagan, the Ó Lachtna of the two Bacs and of Glenn Nemthinne in
- Fir Ceara - barony of Cara, co. Mayo (e.g. Ua Coigligh and Ua Cearnaigh)
- Uí hMaill - Co. Mayo, the country all around Clew Bay, e.g. Ó Máille (O'Malley)
- Cenél Cairpre Mor - northern Co. Sligo and northeast Co. Leitrim, e.g. O'Mulclohy (Ó Maolchloiche)
- Calraighi Móra - eastern Co. Sligo and northeastern Co. Leitrim
- Calraighe Corann - eastern Co. Sligo e.g. O'h Innreachtaigh
- Calraighe Lough Gill - eastern Co. Sligo and northeastern Co. Leitrim, e.g. O'h Innreachtaigh, O'Finn and
O'Carroll (Ó Cearbhaill).
- Calraighi Luirg -northern co. Roscommon, e.g. O'Drean
- Calraige Muirisc - O'Gaughan (Ó Gaibhtheacháin)
- Conmaicne Mara - western co. Galway, namesake for the modern Connemara, e.g. O'Queally (or O'Kealy)
prior to the O'Flahertys.
- Conmaicne Cuile Toladh - centered in Kilmaine barony, County Mayo.
- Conmaicne of Magh Réin - southern Co. Leitrim, and parts of co. Longford, divided into Muintir Eolais
(e.g. MacRannall, Reynolds), Cenel Luachain (e.g. MacDorcy) and Muintir Cearbhallain (e.g. O'Mulvey).
- Luigne - barony of Leyney in Co. Sligo, e.g. O'Hara (Ó hEaghra)
- Gailenga - barony of Gallen in Co. Mayo, e.g. O'Gara (Ó Gadhra)
- Masraige – of Magh Slecht in co. Cavan. This general area ruled by the Ui Briun?? septs of Mac Tighearnáin
(MacTiernan, MacKeirnan) of Tellach Donnchadha (baorny of Tullyhunco); and the Mag Shamhradhain (MacGovern or
Magauran) of Teallach Eochaidh (barony of Tullyhaw) in northwest Co. Cavan.
- Clan Tomaltaigh - Mac Aireachtiagh (MacGeraghty)
- Three Tuathas - Corco Achlann, Cenel Dobtha, and Tír Briúin na Sinna in co. Rocommon,
e.g. MacBranan (Mac Branáin), Ó Maoil Mhicil (O'Mulvihil), O'Monaghan, O'Beirne??, Ó hAinle (O'Hanly).
- Clann Cathail - Ó Maoilbreannain (Mulrennan) and Ó Flannágain (O'Flanagan).
- Clann Murchadha - Ó Fionachta (O'Finaghty)
- Partraige - west and north of Lough Mask. Septs said to originate in this area include Ó Cadhain (O'Coyne),
Ó Dorchaidhe (O'Dorcey or Darcy), Ó Goirmghialla (O'Gormley), Ó Ciaragain (O'Kerrigan) and Ó Tighearnaigh (O'Tierney).
- Grecraige - an ancient group said to inhabit western portions of co. Sligo
- Corca Fhir Trí - of Luigne and Gailenga country, e.g. Ui Dobhailen.
- Ciarraighe Locha na nAirne - barony of Costello, co. Mayo, e.g. Ó Céirín (O'Kieran, Kearns)
- Moylurg, Airtech, and Tir Tuathail - an area centered in the north of Co. Roscommon. Mac Diarmata
(MacDermot, et al) of Uí Mhaoil Ruanaidh.
- Uí Máine - consisting of much of east Galway and south Roscommon. O'Kelly, O'Donnellan and O'Madden,
Ó Concheanainn (O'Concannon), lords of Uí Diarmada near Kilkerrin, Co. Galway; Ó Cobhthaigh (O'Coffey), a branch
of the O'Maddens; Ó Neachtain (O'Naghten), chiefs near Loughrea and later of the Fews (Athlone); Ó Maolalaidh
(O'Mulally or Lally), of the same stock as the O'Naghtens; Mac Eochaidh (MacKeogh), lords of Magh Finn (Moyfinn,
Athlone); Ó Roduibh (Mac Geraghty), one of the four royal chiefs under O'Conor; Ó Fathaigh (O'Fahy), whose territory
came to be known Pobal Mhuintir ui Fhathaigh; Ó Dúnadhaigh (O'Downey), chiefs of Sil Anmchada prior to the O'Maddens.
- Sil n-Anmcadha - in or near the barony of Longford, co. Galway, e.g. Ó Dúnadhaigh (O'Downey), Ó Madudháin
(O'Madden), Ua Braonain.
- Ui Diarmada - parish of Kilkerrin, County Galway, e.g. Ó Concheannainn (O'Concannon).
- Ui Fiachrach Finn - O hEirc, O Neachtain (O'Naghten, O'Naughton) and O Maolalaidh (O'Mullally)
- Maonmagh - a territory round Loch Reagh, co. Galway
- Clann Diarmada and Clann Aedhagáin - barony of Leitrim, e.g. MacEgan
- Clann Flaitheamhail - barony of Moycarn, e.g. MacGiolla Fionnagain and Ó Cionnaoith
- Clann Connmaigh and Clann Murchadha - barony of Ballymoe, e.g. O'Finaghty
- Clan Breasail - barony of Leitrim, e.g. O'Donnellan
- Clann Uadach - parishes of Cam and Dysart in the barony of Athlone, Co. Roscommon, e.g. Ó Fallamhain
- Corco Moga - barony of Killian, e.g. Ó Sgaithgil and Ó Broin
- Síl Máilruain - barony of Ballintubber, e.g. Ó Floinn
- Dealbhna Nuadhat - between the rivers Suck and Shannon
- Dealbhna Thire Dá Locha (of the two lakes) - e.g. MacConry (King) of Moycullen
- Sogaine - centered about the barony of Tiaquin, co. Galway & Mayo, e.g. Ó Mannáin (Mannion), McWards,
O'Scurrys (Scarrys), O'Lennans, O'Casins, O'Gillas, O'Maigins and O'Dugevans (Duggans)
- Dál nDruithne - in Maenmagh, e.g. O'Gabhrain
- Crumthann - (Cruffon, Criffon), baronies of Killian and Ballymoe, e.g. O'Cathail (Cahill), O'Mughroin (Moran), and O'Maolruanaidh (Mulrooney)
- Magh Finn - barony of Athlone, e.g. MacKeogh
- Clann Cernaigh - in Tuaiscert Ui Maine, e.g. Ui Laidhin, Ui Sidhacháin, ...
- Clann Indrechtaigh - a branch of Sil Anmchadha, e.g. Muinter Ruairc, Mac Brain, Mac Muroin, Muinter Mailchadha, ...
- Uí Briúin (various locations)
- Uí Cremthainn (various locations)
- Cenél Cairpre (Sligo and Leitrim)
- Cairpre Gabra (Longford)
- Ui Cairpri (co. Kildare)
- Cenél Laegaire (Fermanagh)
- Cenél Enda (Donegal & Fermanagh)
- Fir Managh (Fermanagh)
- Calraige (co. Leitrim & Sligo)
- Conmaicne Rein (so. Leitrim, north co. Longford)
- Dartraige - northern Co. Leitrim, e.g. MacClancy (Mag Fhlannchaidh)
- Dartraige (so. Monaghan)
- Fernmag (co. Monaghan)
- Glasraighe - the lands bordering Lough Sheelin, near the borders of counties Cavan, Longford, Westmeath and Meath
- Gaileanga (western Co. Cavan and northern Co. Meath)
- Luigne (co. Sligo)
- Luigne (western Cavan and north Meath)
- Masraige (co. Cavan)
- Uí Ailella (co. Sligo)
- Muintir Maelmordha (co. Cavan)
- Muintir Anghaile (co. Longford)
- Muintir Giollagain (co. Longford)
- Teallach Dunchadha (Tullyhunco, co. Cavan)
- Teallach Eachdhach (Tullhaw, co. Cavan)
- Muintir Geradháin (co. Longford)
- Cenél Luachain (co. Leitrim, Longford)
- Clann Fermaighe (co. Leitrim)
- Muintir Chionaoith (co. Leitrim)
- Muintir Cearbhallain (co. Leitrim)
- Magh Breacraighe (co. Longford/Westmeath)
Munster region (see Thomond for more on north Munster)
- Úa n-Dúnlainge - Uí Muiredaig, Uí Dúnchada, Uí Fáeláin.
- Uí Muiredaig (e.g. O'Toole)
- Uí Dúnchada - borders of counties Kildare and Dublin, Mac Gilla Mo-Cholmóg (Fitz Dermot)
- Uí Fáeláin - e.g. O'Byrne
- Uí Cheinnselaig - Sil Fáelchán, Uí Felmeda Thes, Uí Felmeda Tuaid, Sil Máeluidir, Sil Chormaic.
- Sil Fáelchán - Mac Murchadha (Mac Murrough) of Ferns; Ua Finntighearn (Finneran) of northeast
Wexford; Gahan's of Síl Ealaig (Shillelagh in co. Wicklow).
- Uí Felmeda Thes - Offelimy in co. Wexford, e.g. Murphy
- Uí Felmeda Tuaid - the Rathvilly area in co. Carlow, e.g. O'Garvey
- Sil Máeluidir - of Shelmalier, co. Wexford, e.g. Hartley
- Sil Chormaic - River Slaney basin in County Wexford prior to
- Uí Dega - centered at Limerick Hill (Luimnech) in north County Wexford (O'Hay or Hughes)
- Uí Briúin Cuallan - (Cosgrave), their power center at Powerscourt in co. Wicklow
- Ui Bairrche Maighe - co. Carlow
- Ui Bairrche Tire - southern Wexford, e.g. O'Gorman
- Uí Chrimthainn Áin - O'Duff
- Uí Failge - Ua Conchobair Failghe, Uí Riacáin, Clann Máellugra, Clann Colgcan
- Ua Conchobair Failghe - e.g. O'Connor Faly
- Uí Riacáin - e.g. O'Dunne
- Clann Máellugra - e.g. O'Dempsey
- Clann Cholgaín - Ua hUallachain (O'Holohan) and Ua hAonghusa (O'Hennessy) of Clan Cholgaín
in northern Co. Offaly
- Uí Dróna - preserved in the baronies of Idrone East and West in county Carlow, the O'Ryan were
later lords of Uí Dróna
- Uí Enechglaiss - e.g. O'Feary
- Uí Chéthig - nothern co. Kildare, namesake for the barony of Ikeathy
- Ua Máil - Ua Téig, Úa Cellaich Cualann, western foothills of the Wicklow mountains, note the name
Glen of Imaal in that region.
- Ua Téig - of west of the Wicklow mountains. e.g. O'Teige or O'Tighe
- Úa Cellaich Cualann - O'Kelly of the Dublin/Wicklow hills
- Loígis - e.g. Seven septs of Leix (co. Laois), i.e. O'More, O'Kelly, O'Deevy, O'Doran, O'Lalor,
O'Dowling & McEvoy.
- Fothairt in Chairn - giving their name to the barony of Forth, Co. Wexford
- Fothairt of Mag Fea - giving their name to the barony of Forth, Co. Carlow
- Benntraige - Clann Cosgraigh (O'Coskry, Coskerry, Cosgrave), on the plain of west co. Wexford.
- Dál Messin Corb - Uí Garrchon, ...
- Uí Garrchon - later represented by Ua Feghaile clan (O'Farrelly or O'Farrell) of co. Wicklow
- Dál Cairpre Arad - County Tipperary. The septs of Ua Donnacáin (O'Donegan) of Aradh Thíre
and O'Reidy of Aradh are cited in this general areas in the 12th century.
- Dál Chormaic - barony of Kilkea and Moone, represented by Uí Gabla, Uí Labrada, Uí Buide, and
Cuthriage. The parts of Leinster belonging to the Clann Cormaic are Cuthraighe, Ua Trena, Ui Cruinn or Ui Cuinn,
Ua Gabla Fine and Ua Gabla Roireann.
- Uí Gabla - co. Kildare
- Uí Labrada - co. Kildare
- Uí Buide - of Ballyadams, County Leix, e.g. O'Kealy
- Osraighe - a territory co-extension with the diocese of Ossory, a buffer state between the Laigin
and the men of Mumhu.
Thomond regions (north Munster)
- Eóghanachta - Ua Ceallacháin (O'Callaghan), Mac Carthaigh (MacCarthy), Ua Donnchadh
(O'Donohue), Mac Giolla Mochuda (MacGillycuddy), Ua Caoimh (O'Keefe), Ua Muircheartaigh (O'Moriarity),
Ua Suilleabhain (O'Sullivan), among others.
- Eóghanacht Áine (Knockainy parish, Co. Limerick) - O'Ciarmaic (O'Kirwick and Kirby)
- Eóghanacht Airthir Chliach - O'Cuirc (O'Quirke) of Muscraighe Cuirc; O'Cuillen (O'Cullen) of
- Eóghanacht Chaisil [Cashel] - Mac Carthaigh (MacCarthy), Ó Suileabháin (O Sullivan),
Ó Ceallacháin (O Callaghan)
- Eóghanacht Glendamnacht [Glanworth] - (Ó Caiomh (O'Keefe)
- Eóghanacht Locha Lein (Uí Cairpri Luachra) - O'Moriarity, Ó Donnchadha (O Donoghue)
- Eóghanacht Raithlind and the Uí Echach Mumhan - Ó Mathghamhna (O Mahony) of Cenel Aodha;
O'Donoghue, O'Duggan, O'Long, O'Feehin, O'Leary, O'Donnell, O'Connell, Lynch, the Benntraighe (Bantry),
O'Hea, O'Cahalane, O'Coughlan, O'Cannifee, O'Bogue, O'Cronin, O'Flynn, O'Flahiffe, Connelly.
- Eóghanacht Durluis
- Éoganacht Árann (Aran Islands)
- Éoganacht Rois Argait (Co. Tipperary)
- Éoganacht Ua Cathbach (e.g. Ui Cathfhaid Cuile)
- Cenel Cerdraige
- Ua Liathain - Ua Liatháin (O'Lehane)
- Uí Duach - O'Brennan
- Déisi Mumhan - Ua Bric (O'Brick), Ua Faeláin (Phelan/Whelan)
- Déise Becc - centered in the baronies of Small County and Coshlea in southeast county Limerick.
- Ciarraige Luachra - Ua Conchobair (O'Conor Kerry), Ua Muiredaig (O'Murtagh), Ua Neide (O'Neide)
- Ciarraige Cuirche - the barony of Kerrycurrihy located south of the city of Cork.
- Corca Oiche - O'Macasa (e.g. MacKessy and Maxey)
- Orbraige (and Benntraige) - in or near the barony of Orrery (and Kilmore) in northern Co. Cork
- Corco Láigde (Láoighe, Lóegdi or Luighe) - Ua Cobhthaigh (O'Coffey), Ua Dubhchonna (ODowney),
Ua h-Etersceóil (O'Driscoll), Ua Fitheligh (O'Fealy), Ua Floinn (O'Flynn), Ua h-Aonghasa (O'Hennessy), Ua Laochdha
(Leahy), Ua Laoghaire (O'Leary), Ua Longáin (O'Longan), Ua Duinnin (O'Dinneen), Ua hAodha (O'Hea), O'Doheny,
O'Fehilly, O'Doughan, O'Dunlea, Kevane.
- Múscraige Tíre - northern Tipperary, barony of Lower Ormond - Ua Donnghaile (O'Donnelly),
Ua Dúnlaing (O'Dowling).
- Múscraige Tri Maighe [Muskerry of the Three Plains] - in Orrery and Duhallow, Co. Cork - Ua Donnocáin
- Múscraighe Mittaine - present baronies of east and west Muskerry and Barrett's in Co. Cork -
O'Donegan (see Múscraige Tri Maighe).
- Múscraige Breógain (or Cuirc) - southwest Tipperary, barony of Clanwilliam - Ua Chuirc (O'Quirke).
- Muscraige Uí Fhloinn [Muskerrylinn] - between Ballyvourney and Blarney - O Floinn (O'Flynn).
- Muscraige Luachra - County Limerick/Tipperary. O'Hea, chief of Muscry Luachra, a territory lying
between Kilmallock and Ardpatrick, in the barony of Coshlea, in the county Limerick.
- Corco Duibne - Ua Failbhe (O'Falvey), Ua Séghdha (O'Shea) and Ua Congaile (O'Connell)
- Fir Maige Féne - a non-Eoghanacht group centered at Fermoy, co. Cork.
- Clann Dealbhaoith - Ua Nihill (O Neill) of Tradraige; Craobhach (Creagh).
- Osraighe - (anciently considered part of Munster) - Fitzpatrick, Ua Dubhsláine (O'Delany), Ua hÚrachán (O'Horahan),
Ua Bruaideadha (O'Brody, Broderick); Ua Caellaighe (O'Kealy, O'Kelly) of Dairmag Ua nDuach; Ua Bróithe (O'Brophy)
of Mag Sédna; Ua Caibhdheanaigh (O'Coveney, Keveny) of Mag Airbh; Ua Glóiairn (O'Gloherny, Glory, O'Gloran, Cloran)
of Callann; Ua Donnachadha (Dunphy, O'Donochowe, O'Dunaghy, O'Donoghue, Donohoe, Donagh) of Mag Máil; Ua Cearbhaill
(O'Carroll, O'Carrowill, MacCarroll) of Mag Cearbhail; Ua Caollaidhe (O'Kealy, O'Coely, Quealy) of Uí Bercháin (Ibercon);
Mac Braoin (MacBreen) of Na Clanna; Ua Bruadair (O'Broder, Broderick) of Uí nEirc (Iverk); Ua nDeaghaidh (O'Dea) of
Uí Dheaghaidh (Ida).
- Dál gCais - Ó Briain (O'Brien) of Uí Toirdealbhaigh, Mac Conmara (MacNamara), Ó Cinnéide
(Kennedy), Ó hEachthianna (Ahern or Hearne), Ó Beolláin (O Boland), Mac Fhlannchaidh (Mac Clancy), Mac
Consaidín (MacConsidine), Mac Cochláin (Mac Coughlan), Ó Fhógartaigh (O Fogarty), Ó Gradaigh (O Grady),
Mac Domnaill (MacDonnell), Ó hAnrachain (O Hanrahan), Ó hArtagáin (O Hartigan), Ó hIcidhe (Hickey),
Ó hÓgáin (Hogan), Ó Urthaile (O Hurley), Ó Cearrnaigh (Kearney), Ó Céileachair (Kelleher), Ó Cadhla (Kiely),
Mac Mathghamha (MacMahon), Maol Dhómhnaigh (Moloney, Mullowney or Maloney), Ó Maolchaoine
(O Mulqueen), Ó Neachtain (O Naghten), Ó Cuinn (O Quinn), Ó Murruanaidh (O'Moroney), Ó Raogáin (O Regan
or Reagan), Ó Seanachain (O Shanahan), Ó Siodhacháin (Sheehan), Mac Giolla Iasachta (MacLysaght),
Ó Gealbhain (O'Galvin), Ó Meadhra (O'Meara, O'Mara), Mag Raith (MacGrath), O'Durack.
- Síl Cennétich - baronnies of Upper and Lower Ormond, e.g. Ó Cinnéide (Kennedy)
- Muintir Ifernain - O'Quinn of Corofin in the county Clare
- Ui Fearmaic - Ó Deaghaidh (O'Dea)
- Cineal Cuallachta - O'gRiobta of Inchiquin, Co. Clare; (Ó Griebhta (O'Griffey)
- Corco Mruad - Ua Conchobhair (O'Conor Corcomroe), Ua Lochlainn (O'Loughlin), Mac Cruitin
(MacCurtin), Ua Diocholla (O'Deely), Ua Drinan (O'Drennan), Ua Maoleidigh (O'Melody), Ua Dabhoireann (O'Davoren).
- Corco Baiscind - Ua Bascinn (O'Baskin), Mac Diarmata (MacDermot), Ua Domhnaill (O'Donnell, or
- Éile - Ua Cearbhaill (O'Carroll), Ua Clérig (O'Clery), Ua Breaslain (O'Breslin), Ua Corcrain (O'Corcoran),
Ua Flannagain (O'Flanagan), Mac Eochaidh (MacKeogh), Ua Meachair (O'Meagher), Ua Riordan (O'Rearden)
- Éile Uí Fhógartaigh - barony of Eliogarty, co. Tipperary; Ua Fógartaigh (O'Fogarty)
- Dal Cairpri Arad, Aradh Tíre and Aradh Chliach - Ua Donnacáin (O'Donegan) of Arad or Aradh Thíre;
Ua Duibhir (O' Dwyer); O'Reidy.
- Uaithne - Four Tribes of Owney (Uaithne) were described as O'Heffernan, O'Calahane, O'Loinsigh (Lynch)
and MacKeogh. O'Cahalane or Culhane (Ua Cathalain) of Owney Beg (Uaithne Cliach); Ua Duinechair (O'Dinan);
O'Mulryans of Corfin, Co. Clare.
- Uí Fidgeinti - O'Donovan, O'Collins, Lyons, Ó Flannabhra (Flannery) of Dal Cairbri;
- Cenel Conaill of Munster - O'Hegarty and O'Carroll
- Uí Chonaill Gabra - Ua Cinnfheadlidh (O'Kinneally), Ua Cuileain (O'Cullane), O'Sheehan, and O'Billry.
- Uí Cairbre Aedha - Ua Donnubáin (O'Donovan), Mac Inneirghe (MacEnery)
- Ua Laegaire of Munster - of Uí Fidgeinti
- Ua Setnai - of Uí Fidgeinti
- Cineal mBaoith - Ua hArtagain (O'Hartagan), Ua Longargain (O'Lonergan).
- Corca Thine - O'Cathail (O'Cahill)
Uladh region (east Ulster)
- Uí Cremthainn - Clann Nadsluaig, Clann Lugain, Sil nDamine, Clann Ceallaigh, et al.
- Clann Nadsluaig - O'Carroll, McMahon, ...
- Clann Lugain - Maguire, McManus, ...
- Sil nDamine - Mael Ruanaigh, ...
- Truagh - of northern co. Monaghan, e.g. Mac Murchadha, Mac Kenna of the southern Ui Neill, ...
- Sil Maeluidir - Ua Baigeallain (O Boylan) of Dartraige (Darty, western co. Monaghan)
- Mugdorna - the area about barony of Cremorne, co. Monaghan, e.g. Ua Machainen
- Fernmag, or Fernmaighe - an area about the barony of Farney, co. Monaghan,
e.g. Ua Cearbhaill (O'Carroll),
O'Kieran (Ó Ciaráin) of Tir Eoghan.
- Airthir (Airtheara) - about the eastern baronies of Orior, co. Armagh, e.g. Ua Ruadhacain (O'Rogan)
- Uí Nialláin (Clan Cernaich) - about thebaronies of Oneilland East and West, co. Armagh,
e.g. Ua hAnluain (O'Hanlon).
- Uí Breasil Airthir - northern co. Armagh, e.g. O'Keelaghan (O Ceileachain) of Uí Breasil Airthir
- Uí Breasil Macha - northern co. Armagh, e.g. O Gairbhith (O'Garvey), MacCann's, lords of Clanbrassil
- Uí Méith - northern Co. Louth, eastern Armagh and later in Monaghan, e.g. O hInnrechtaigh (Hanratty),
Ua hAnluain (O'Hanlon).
- Ui Tuirtre - originally an area west of Lough Neagh, e.g. O'Lynn, O'Flynn
- Derlas - possibly in Ui Tuitre, co. Antrim.
- Uí Meic Uais - Ua Comhraidhe (O'Curry) of Uí Mac Uais Mide (Moygoish barony, co. Westmeath),
as well as Ua hAonghusa (O'Hennessy) of Uí Mac Uais Breg (Upper Kells/Lower Navan baronies, co. Meath).
- Fir Managh - in co. Fermanagh, e.g. O'hEignigh ( O'Heany or Hegney), O'Maolruanaidh (Mulrooney),
O'Dubhdara, Meicc h-Uidir (Maguire).
- Uí Fiachrach Arda Srátha - e.g. Ó Críochain (O'Crehan) of Ardstraw, Co. Tyrone
- Síl Daim Argait - Sil nDaimine and Clann Lugainn
- Dartraige - barony of Dartree in west co. Monaghan, e.g. Ó Baoighealláin (O'Boylan)
- Uí Briúin Archaille - near Dungannon, co. Tyrone, e.g. Ua Tuamain
- Uí Labrada - clann Colla Fochríth
- Uí Dorthainn - near Navan, co. Meath
- Uí Cormaic - clann Colla Uais
- Ui mac Carthainn - near Lough Foyle, Tirkeeran, co. Derry, e.g. O'Colgan and O'Connell.
- Fir Lemna - one of the Trí Tuatha of Oirghialla located in co. Tyrone
- Síl Duibthir - e.g. Ua Laithéin
- Clann Sínaigh - barony of Orior, county Armagh.
- Uí Cennfhada - barony of Tirkennedy, co. Fermanagh, e.g. Ó Daimhín
- Uí Tréna - located in co. Armagh?
- Muinter Pheodachain - west of Lower Loch Erne, e.g. Mac Gilla Fhinnein
- Uí Dáire - clann Colla Fochríth
- Uí Meic Brócc - clann Colla Fochríth
- Uí Tuathail - clann Colla Fochríth
- Dál n-Oaich - clann Colla Fochríth
- Fir Lurg - barony of Lurg in Co. Fermanagh, .e.g. Ó Aedha (O'Hayes or Hughes?)
- Ui Laoghaire of Loch Lir - in Tyone, east of the barony of Lurg in County Fermanagh, Muintir
Taithligh (e.g. Tilly, Tully or MacTully)
- Fir Li - in and near the barony of Coleraine, co. Derry, e.g. O'Flynn
- Fir Rois - the area about Carrickmacross, e.g. O'Finn.
- Tuath Rátha - barony of Magheraboy, co. Fermanagh, e.g. Ui Fhlannagáin (O'Flanagan).
Northern Ui Neill regions
- Clann Conaill Cernaich - Dál n-Araide, Úi Echach Ulad, Conaille Murthemni, Laígsi Laigen (of Leinster), Sogaine.
- Dál Fiatach - coastal co. Down, e.g. Ó hEochaidh (O'Haughey or O'Hoey), Mac Duinnshleibhe (MacDonlevy),
Mac an Ultaigh (MacNulty), Mac Con Ultaigh (MacNally). Leth Cathail and Dál Fiatach share common ancestry.
- Dal Riada - northern county Antrim, and in Scotland. Ó Floinn (Clann Colla) were chiefs in Dál Riada (Ireland)
in the 12th century.
- Dál nAraidhe - south Antrim and north Down. e.g. Ua Lethlobhair, Ua Loingsigh (Lynch), and the Uí Eathach Cobha.
- Cruithne - equated with an ancient people in Ulster, occupying an area of south Antrim and north Down (Dál nAraidhe).
- Uí Eathach Cobha - Ua h-Aiteidh, Clann Aodha, Mag Aonghusa (Magennis, McGuinness).
- Conaille Muirtheimhne - in and near the barony of Dundalk in county Louth, e.g. Ua Cuilennáin.
- Cuailgne - remembered in the parish of Cooley in county Louth.
- Leth Cathail - baronies of Upper and Lower Lecale, county Down, e.g. Ua Flathraoi.
- Kinelarty - named for the Cíneal Fógartaígh, e.g. Mac Artán (MacCartan)
- Uachtar Tíre - southern county Down.
- Dál mBuinne - southern county Antrim (e.g. Ua Serraigh)
- Laígsi Laigen - Seven septs of Leix - Ua Mórdha (O'More), O'Kelly, O'Deevy, O'Doran, O'Lalor,
O'Dowling and McEvoy.
- Sogaine - of Connacht - Ó Mannáin (Mannion), McWards, O'Scurrys (Scarrys), O'Lennans,
O'Casins, O'Gillas, O'Maigins and O'Dugevans (Duggans).
Southern Ui Neill regions
- Cenél Eóghain (Clan Neill) - Ó Neill (O'Neill), MacLochlainn (McLaughlin), Mac Anna or Canna
(MacCann) of Clanbrassil, Ó Fearáin (O Fearon) of Oriel, MagUiginn or MacGuagáin ( MacGuigan),
Ó hEigceartaigh (Hegarty), Mac Cearnaigh (Kearney).
- Cenél Eóghain - Clan Domnaill, Clan Birn, Cenél Fergusa, Cenél Binnigh, Cenél Moen,
Cenél Fearadhaigh, Cenel Tigernaich, Muintir Devlin, Cenel Aenghusa, Clan Conchobhair, Clan Diarmatta,
An Breadach, Clann Aodha Buidhe.
- Clan Domhnaill - Ó Donnghaile (O'Donnelly) of Fear Droma Lighen
- Clan Birn - Muintir Birn, barony of Dungannon, e.g. O'Donegan or Dongan, Ó Murchadha and
Mac Murchadha (MacMorough, Murphy),
Ó Firghil (O Friel, Farrell, Freel), and MacRory or MacRogers in the baronies of Dungannon and Strabane
- Cenél Conaill - Sil Lugdach, Cenel Bóguine, Tir Ainmireach & Tir Aedha, Cenel Duach
- Cenél Enda - originally of so. Co. Donegal and no. Fermanagh - Ó Breislein (O Breslin)
of Fanad, MacDuane.
- Cenél Cairpri Mor - Ó Maolchloiche (O'Mulclohy) of Sligo & Leitrim
- Cenél Ferghusa - Cenel Coelbad, O'Hagan of of Telach oge, Ó Cuinn (O'Quin), O Bruadar (O'Broder),
and ??O'Mallon (O'Mellan)??
- Cairrge Brachaidhe - in the barony of Inishowen West, County Donegal, e.g. O Mael Fhabaill (Mulfoyle,
- an Bredach - O'Duibhdiorma (O'Dwyorma, Dermott) of the parishes of Upper and
Lower Moville, in the barony of Inishowen.
- Cenél mBinnigh - Ó hAghmaill (O'Hamill)
- Cenél Moen - Ó Gairmleadhaigh (O Gormley), O Duinechhaidhh, Ó Croidheáin (O Crean),
Ó Lúinigh (O Lunny), O Tierney, O Kelly, O Cernaghan, O Garvey, MacDonaghy, O'Patton (Peyton)
- Cenél Fearadhaigh - MacKeaghery, MacGilmartin; MacPetridge, MacCathmhaoil (Mac Cawell,
Campbell), Ó Brollacháin (O Brollaghan), Ó Fearadhaigh (Ferry,Fairy).
- Cenel Tigernaich - O'Mulfoharty, and O'Heodhasa or O'Hosey, O'Cunigan, Tierney
- Cenel Mic Earca - vicinity of the barony of Clogher, co. Tyrone
- Fir Maige Itha - Magh Ith, e.g. Cenél Moain and O'Cairellan of Clann Diarmada
- Clan Conchobhair - Ó Cathain (Kane, O'Cahan), O'Mullan, MacCloskey and the Clan Diarmatta.
- Ciannachta of Glenn Geimin - Glengiven, barony of Keenaght, County Derry, e.g. O'Connor.
- Clan Diarmatta (Clandermot) - O'Cearbhallin (O'Carolan), Mac Ettigan (Mac Eitigen)
- Cenel Aenghusa - e.g. ua Cairpre.
- Cenél Aedha - the area of Tír Aedha, barony Tirhugh, e.g. Ó Maeldoraidh, Ó Canannáin (O'Cannon) and Ó Gallchobhair (O'Gallagher)
- Sil Lugdach - O'Donnell, O'Boyle of Tir mBoghuine and Tir Ainmireach, Ó Dochartaigh (O Doherty) of
Ard Miodhair, MacGilbridy, ...
- Arda Midhair - barony of Raphoe, e.g Ó Dochartaigh (O'Doherty)
- Cenel mBógaine - e.g. ua Murchadha
- Tir Ainmireach - barony of Boylagh, e.g. Ua Bhaeighill (O'Boyle) of Clan Chindfaoladh
- Rosguill - and Ros-Iorguil, promontories west of Fanad, e.g. Mac Giolla Shamhais, and MacSweeney Na Doe
- Finn Ros - aka The Rosses, barony of Boylagh, e.g. O'Furadhrain
- Fánad - peninsula between Lough Swilly and Mulroy Bay, e.g. O'Breslen and Mac Sweeney Fanat
- Cenel Duach - 6th century king of Tara
- Cenel Lóigaire - clan Clan Lugdach, Ua Caindealbahin (O'Kenellan, Connellan,
Quinlan) of the Navan baronies, co. Meath.
- Clan Colmáin - Ua Maoilseachliann (O'Melaghlin, MacLoughlin), kings of Meath
- Sil Áeda Sláine - Mac Giolla Seachloinn (Mac Glaughlin), lords of south Bregia, of
Skreen & Ratoath baronies, co. Meath,... et al.
- Cairpre Gabra - Ua Ronain (O'Ronan) Granard barony, Longford
- Uí Cairpre Laigin - Ua Chiardha (O'Keary, O'Carey) of Carbury barony, co. Kildare
- Cinel Fiachach - Mac Eochagain (Mac Geoghegan) of Moycashel barony, Westmeath
- Fir Cell (Fercal) - Ua Maoil Mhuaidh (O'Molloy) of Ballyboy & Ballygowan baronies, Offaly
- Fir Tethba (Teathbha, Teffia) - Ua Lachtnain (O'Laughnan) of Moygoish barony, Westmeath,... et al.
- Muinter Tadgain - Ua Catharnaigh (O'Carney, Sinnach and Fox) of Tethba centered in Kilcoursey, co. Offaly.
- Delbna Mor - Ua Finnallain (Fenelon) of Delvin barony, Westmeath
- Delbna bEthra - Mac Cochlain (Mac Coughlan) of Garrycastle, Co. Offaly
- Delbna Bec - Ua Maoil Challan (Mulholland) of Fore barony, co. Westmeath
- Delbna Iathair - Ua Scolaidhe (O'Scully) of Delvin and Rathconrath baronies, Westmeath
- Annaly - Ua Fearghail (O'Farrell) of Muintir Anghaile centered near Moydow barony, Co. Longford
- Fir Arda Ciannachta - Ua Cearbhaill (O'Carroll) of Ferrard barony, co. Louth
- Fir Chul Breg - near the barony of Upper Kells in Co. Meath
- Fir Chul Tethba - barony of Rathconrath in Co. Westmeath
- Deisi Brega - located in or near modern co. Meath.
- Fir Tulach - Ua Dubhlaoich (O'Dooley) Fartulagh barony, co. Westmeath
- Uí Maic Uais Breg - Ua hAonghusa (O'Hennessy) in Upper Kells/Lower Navan baronies, Meath
- Uí Mac Uais Mide - Ua Comhraidhe (O'Curry) of Moygoish barony, Westmeath
- Ui Maic Uais Mide - Ua Maoil Tuile (Mac Tully) of Fore barony, co. Westmeath
- Mac Fíodhbhaidhe - (MacEvoy) of Moygoish barony, Westmeath (later of Co. Leix)
- Conmaicne Midhe - Ua Braoin (O'Breen) of Clonlonan barony area of Westmeath.
- Conmaicne Bec - Ua Tolairg (O'Toler) of Quirene in Kilkenny West barony, co. Westmeath
- Muintir Maoil Sionna - Mac Carrgamhna (Mac Caron or Gaffney) of west co. Westmeath &
south co. Longford
- Muintir Tlámáin - Mac Aodha (MacGee) of Rathconrath/Moyashel baronies, co. Westmeath
- Calraige - southern county Longford, e.g. Mic Amhalgadha (Mac Awly)
- Caille Follamhain - barony of Moygoish, in the north of county Westmeath, e.g. Ua Lorcáin and Ua Cleircein
- Bregmuine (Bregmaine) - Ua Braoin (O'Breen) [Uí Domnaill] of Brawney barony, co. Westmeath
- Fir Bile - Ua hAinbheith (O'Hanfey) of Farbill barony, Westmeath
- Saithne - Ua Caitheasaigh (O' Casey) of Saithne Brega of northern co. Dublin
- Luigni Mide - Ua Braoin (O'Breen) and Ua Cernachain (O'Kernaghan) of Lune barony, co. Meath
- Gailenga Mor - Ua Leochain (O'Loughan) of Morgallion barony
- Gailenga Bec - Ua hAonghusa (O'Hennessy) of the Co. Dublin/Meath border
- Muintir Laoghachain [or Laedagain] - Mac Con Meadha (MacConway) of west co. Westmeath &
south co. Longford
- Crich na Cetach - Ua Fallamhain (O'Fallon) of Upper Moyfenrath barony, Meath; and in Warrenstown
barony, co. Offaly.
- Brega - Ua Duinn (O'Dunne) of Skreen barony, co. Meath, et al.
- Knowth - Ua Dubhain (O'Duane or O'Devine) of Upper Slane/Lower Deleek baronies, co. Meath
- Brug na Bóinne - Ua Maoil Lughdhach (O'Molluwey?) of Upper Slane/Lower Deleek, co. Meath
- Odba (Odra, sometimes Olba) - Ua hAodha (O'Hay, O'Hea, O'Hugh) of Skreen barony, co. Meath
- Creeve - Ua Braonain (O'Brennan) of [Cenél nÉnna] in Moycashel barony, co. Westmeath
- Teallach Conmasa - Mac Ruairc (Mac Rourke) of [Cenél nÉnna] in Moycashel, co. Westmeath
- Corco Adaim - Ua Dalaigh (O'Daly) of [Uí Maine branch of southern Uí Neill] in Moyashel &
Magheradernon barony, Westmeath.
- Corco Roide - Ua hIonnradhain (O'Heneran) of Corkaree & Moyashel baronies, co. Westmeath
- Calraige Midhe - Mac Amhalghadha (MacAuley) of Ballyloughloe, Clonlonan barony of co. Westmeath
- Tuath Buada - Ua Cairbre (O'Carbury) of Clonlonan barony of co. Westmeath
- Tellach Modharain - Ua Donnchadha (O'Donoghue) of Moyashel & Magheradernon barony,
- Clann Cholgaín - Ua hUallachain (O'Holohan) and Ua hAonghusa (O'Hennessy) of Clan Cholgaín
in northern Co. Offaly
- Muintir Cionaetha - Mic Uallacháin (Mac Cuolahan) of Garrycastle, Co. Offaly
- Four Tribes of Tara - Ua Riagain (O'Regan); Ua Conghalaigh (O'Connolly) of Upper Kells barony,
Meath (later of Monaghan).
- Four Tribes of Tara - Ua Ceallaigh (O'Kelly) of the Navan baronies, Meath; Ua hAirt (O'Hart) of
Moygoish barony, Westmeath.
The Athach-Tuatha, or Aicme of the Aiteachaigh, are described as the unfree tribes, or tribute-paying tribes, and in the Revue Celtique were said to consist of 42 groups; including the Bendtraighe, Bibhraige, Bladhraige, Bodhraige, Bolgraighe, Brudhraige, Cairighe, Caraighe, Clibraighe, Conraighe (Tuath Connraige), Corcoighe, Crotraighe; Corco ainge, Corco bil, Corco dedha, Corco milce, Corco muighe, Corco teilgind; Dál n-aidne, Dál mbernadh, Dál didail, Dál mac con, Dál mathrach, Dál muighaidhe, Dál muighe, Dal murcon, Dal Nuiste (n-Uisce), Fedraige, Gabraige, Glasraige, Grandraighe, Gregraige of Loch Gara, Gregraige of Berehaven, Lughraige, Lusraige, Mendraige, Rathraige, Rochraige, Seinraige, Sodhraige, Tradraige, Uaraige.
Some of these tribes are noted in the historical period, and include the population groups known as the Grecraige, Tradraige, Garbraige and Glasraige, among others. Some of these are referred to as remnants of the original Firbolg, Damnonian, or other ancient population groups.
Other Aicme (groups) of the Aiteachaigh, many noted in the Book of Ballymote, are cited as the Boccraidhe, Tuath Cruithneach, Corco Orchten, Catraige (crotraighe), Corco bruidhi, Corco sochlend, Curaigh, Dál mendato, Dál mocoirp, Teochraighe, Tuath Airbri, Tuath Aithechdha, Tuath Cathbarr, Tuath Eminrighe, Tuath Firbb, Tuath Guairi, Tuath Ochuine, Tuath Luigne, Tuath Nebluirg, Tuath Resent Humoir, Tuath Sengnaigh (Senmogad), Tuath Tregae.