| Surname | Country | State | County or Province | From | To | Member |
|---|---|---|---|---|---|---|
| Pace | USA | Kentucky | Washington County | 1650 | present | P009-1 |
| Pace | USA | Illinois | Warren County | 1650 | present | P009-1 |
| Pace | USA | Iowa | Muscatine County | 1650 | present | P009-1 |
| Packard | A010-1 | |||||
| Paden | M031-1 | |||||
| Page | USA | Kentucky | Graves County | 1820 | present | M012-1 |
| Pahanish | Slovakia | Poruba | Spis | 1800 | present | C008-1 |
| Painter | Germany | bef 1830 | 1830 | D005-1 | ||
| Painter | USA | Kentucky | bef 1830 | 1830 | D005-1 | |
| Painter | USA | Missouri | Henry County | 1830 | present | D005-1 |
| Palega | USA | Michigan | D016-1 | |||
| Palega | USA | Indiana | D016-1 | |||
| Palega | USA | Illinois | D016-1 | |||
| Palmaro/Palmara | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1600 | 1768 | J009-1 |
| Palmer | A010-1 | |||||
| Panchura | Slovakia | Medzilaborce | 1800 | present | C008-1 | |
| Paquin | Canada | Quebec | A002-1 | |||
| Park | USA | Illinois | W012-1 | |||
| Parrish | USA | North Carolina | J009-1 | |||
| Parsh | USA | Ohio | Seneca County | 1850 | present | A009-1 |
| Partyka | C014-1 | |||||
| Paternoster | Italy | Trentino | Alto Adige | 1800 | 1872 | J009-1 |
| Patterson | A010-1 | |||||
| Paul | USA | Ohio | 1700 | 1900 | F009-1 | |
| Paul | USA | Indiana | 1700 | 1900 | F009-1 | |
| Paulini | Austria-Hungry | Slovenske Pravno | 1850 | Present | H014-1 | |
| Pauliny | Austria-Hungry | Slovenske Pravno | 1850 | Present | H014-1 | |
| Paulus | T013-1 | |||||
| Pavliny | Austria-Hungry | Slovenske Pravno | 1850 | Present | H014-1 | |
| Pawilkowski | Poland | Prussy, Wabrzezno | 1700 | 1850 | S017-1 | |
| Pearce | England | Kent | Woolrich | 1850 | present | D013-2 |
| Pearlman | Belarus | Minsk | K010-1 | |||
| Peau | France | J009-1 | ||||
| Peau | Haiti | St Domingue | J009-1 | |||
| Peck | USA | Illinois | Piatt County | 1880 | present | M025-1 |
| Pederson | Norway | Telemark | Verdalen | 1870 | present | O001-1 |
| Pederson | USA | Minnesota | Hennepin County | 1870 | present | O001-1 |
| Pederson | USA | Wisconsin | St Croix County | 1870 | present | O001-1 |
| Peglione/Pegliona | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1520 | 1636 | J009-1 |
| Pehanich | Slovakia | Poruba | 1800 | present | C008-1 | |
| Pehrsdotter | Sweden | Gotland | Levide | 1792 | T007-1 | |
| Peiffer | Luxembourg | Heiderscheid | 1800 | present | S005-1 | |
| Pekarsky | Ukraine | Zhitomir | K010-1 | |||
| Pelham | Belarus | Minsk | K010-1 | |||
| Pelligiano | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1580 | 1670 | J009-1 |
| Peltzer | Ukraine | Zhitomir | K010-1 | |||
| Perdigon | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1607 | 1690 | J009-1 |
| Perols/Peyraux | France | Périgord | Dordogne | 1590 | 1742 | J009-1 |
| Peterson | Denmark | Moen | Frenderup | 1840 | 1900 | J009-1 |
| Peterson | Sweden | Kronosberg | Virestad | 1871 | present | M023-1 |
| Peterson | USA | Illinois | Cook County (Chicago) | M023-1 | ||
| Peterson | W006-1 | |||||
| Petit | France | Périgord | Dordogne | 1738 | 1838 | J009-1 |
| Petrick | Germany | B016-1 | ||||
| Petrick | USA | Wisconsin | B016-1 | |||
| Petrick | USA | Illinois | B016-1 | |||
| Petz | Germany/Poland | Mur Goslina Parish | Poznan | 1865 | 1888 | R003-1 |
| Petz | USA | Illinois | LaSalle County | 1887 | 1942 | R003-1 |
| Peytavi | France | Périgord | Dordogne | 1600 | 1731 | J009-1 |
| Pfad | A010-1 | |||||
| Pfannkuche | Germany | Holzminden | 1600 | present | P010-1 | |
| Phelan | Ireland | before 1850 | M019-1 | |||
| Phelan | USA | 1850 | present | M019-1 | ||
| Phelps | USA | Connecticut | Hartford (Winsor) County | 1700 | 1835 | W004-1 |
| Philion | Canada | Ottawa | 1863 | 1900 | B003-1 | |
| Philion | Canada | Saskatchewan | 1890 | present | B003-1 | |
| Phillips | Ireland | O004-1 | ||||
| Phillis | USA | Pennsylvania | 1744 | A007-1 | ||
| Phillis | USA | Ohio | 1744 | A007-1 | ||
| Phillis | USA | Illinois | 1744 | A007-1 | ||
| Pickett | Ireland | L008-1 | ||||
| Pickett | USA | Pennsylvania | L008-1 | |||
| Pierce | USA | New York | 1800 | present | D013-2 | |
| Pierce | USA | New York | Sullivan County | 1700 | 1840 | N001-1 |
| Pierce | USA | New Jersey | Hudson County | 1800 | present | D013-2 |
| Pierce | USA | Pennsylvania | Clearfield County | 1830s | 1860 | N001-1 |
| Pierce | USA | Illinois | McHenry County | 1861 | 1869 | N001-1 |
| Pierce | USA | Iowa | Buchanan County | 1870 | 1880 | N001-1 |
| Pierscionek | Germany | 1883 | 1942 | D016-1 | ||
| Pierscionek | Russia | 1883 | 1942 | D016-1 | ||
| Pierscionek | USA | Indiana | 1883 | 1942 | D016-1 | |
| Pierscionek | USA | Illinois | 1883 | 1942 | D016-1 | |
| Pike | Canada | Newfoundland | bef 1910 | D005-1 | ||
| Pin/Pino | France | Provence-Alpes-Côte-d'Azur | Alpes-Maritimes | 1550 | 1822 | J009-1 |
| Pirrung | USA | West Virginia | 1840 | 1910 | M024-1 | |
| Plautz | USA | Illinois | Kane County | B016-1 | ||
| Pleckl | A010-1 | |||||
| Plonski | Poland | Bialystock | Bajki Zalesie | 1860 | present | M030-1 |
| Plonski | USA | IL | City Chicago | 1860 | present | M030-1 |
| Plotsky | Poland | 1880 | present | I002-1 | ||
| Plotsky | USA | Illinois | Cook County | 1880 | present | I002-1 |
| Poggio | Italy | Piemonte | Asti | 1800 | 1890 | J009-1 |
| Pool | USA | Georgia | 1800 | present | J003-1 | |
| Pouillat | France | Périgord | Dordogne | 1650 | 1750 | J009-1 |
| Powers | Ireland | County Waterford | L008-1 | |||
| Powers | W008-1 | |||||
| Powers | USA | Illinois | L008-1 | |||
| Prater | USA | Illinois | White | 1851 | 1935 | F014-1 |
| Preisser | Germany | Dofering | 1801 | 1838 | W008-1 | |
| Priami | Italy | Tuscany | Lucca | 1860 | 1920 | J009-1 |
| Priami | USA | Illinois | 1920 | 2007 | J009-1 | |
| Price | USA | Missouri | Pike County | 1830 | Present | H014-1 |
| Priestley | England | B005-1 | ||||
| Priestley | France | B005-1 | ||||
| Priestley | Denmark | B005-1 | ||||
| Primas | Germany | B016-1 | ||||
| Primas | USA | Illinois | B016-1 | |||
| Primas | USA | Wisconsin | B016-1 | |||
| Prince | Canada | Quebec | B026-1 | |||
| Prince | USA | New Hampshire | Hillsborough County/Manchester | B026-1 | ||
| Pring | England | Kent County | 1828 | 1931 | D011-1 | |
| Pring | USA | Maryland | Baltimore City and Charles County | 1870 | 1930 | D011-1 |
| Prosser | M001-1 | |||||
| Prugh | D002-1 | |||||
| Prusinski | Poland | Bialystock | Bajki Zalesie | 1860 | present | M030-1 |
| Prusinski | USA | IL | City Chicago | 1860 | present | M030-1 |
| Pulskamp | Germany | Hanover | Merzen | 1770 | 1850 | B018-1 |
| Putnam | M026-1 |