| SURNAME | STATE | RESEARCHER | ||
| CAIN | Ireland | A. Reilly | ||
| CAIN | VA | A. Reilly | ||
| CAIN | KY | A. Reilly | ||
| CALDWELL | Wales | V. Williams | ||
| CALDWELL | PA | V. Williams | ||
| CALDWELL | KY | V. Williams | ||
| CALDWELL | IN | V. Williams | ||
| CALKINS | MA | D. Perkins | ||
| CALKINS | CT | D. Perkins | ||
| CALKINS | Wales | D. Perkins | ||
| CALVERT | MD | J. Vaughn | ||
| CALVERT | OH | J. Vaughn | ||
| CALVIN | MO | P. Minch | ||
| CAMPARIN | Switz | A. Reilly | ||
| CARDWELL | VA | C. Stowe | ||
| CARDWELL | NC | A. Reilly | ||
| CARMACK | Scotland | D. Morgan | ||
| CARMACK | MD | D. Morgan | ||
| CARMACK | TN | D. Morgan | ||
| CARMACK | OK | D. Morgan | ||
| CARNAHAN | PA | M. Lawson | ||
| CARNAHAN | IL | M. Lawson | ||
| CARNEY | OH | A. Reilly | ||
| CARNEY | IL | A. Reilly | ||
| CARPENTER | OH | J. Simonson | ||
| CARPENTER | MA | R. Carpenter | ||
| CARPENTER | NY | R. Carpenter | ||
| CARR | TX | P. Minch | ||
| CARR / KERR | RI | K. Brahms | ||
| CARR / KERR | Scotland | K. Brahms | ||
| CARR/KAR/GEHR | Germany | A. Reilly | ||
| CARR/KAR/GEHR | Switz | A. Reilly | ||
| CARR/KAR/GEHR | VA | A. Reilly | ||
| CARR/KAR/GEHR | WV | A. Reilly | ||
| CARR/KAR/GEHR | IN | A. Reilly | ||
| CARRICO | MD | E. Rogers | ||
| CARRICO | KY | E. Rogers | ||
| CARTER | VA | E. Rogers | ||
| CARTER | TN | E. Rogers | ||
| CARTER | NC | A. Reilly | ||
| CARTWRIGHT | NC | A. Reilly | ||
| CARTWRIGHT | IN | A. Reilly | ||
| CASE | England | A. Reilly | ||
| CASE | CT | A. Reilly | ||
| CECIL | England | A. Reilly | ||
| CECIL | MD | A. Reilly | ||
| CECIL | VA | A. Reilly | ||
| CHAFFIN | TN | J. Lawson | ||
| CHAFFIN | CA | J. Lawson | ||
| CHAMBERLAIN | Canada | B. Marsh | ||
| CHAMBERLAIN | MI | B. Marsh | ||
| CHAMBERLAIN | WA | B. Marsh | ||
| CHAMBERS | KY | D. Frandsen | ||
| CHEATHAM | VA | B. Rogers | ||
| CHEVALIER | PA | D. Young | ||
| CHEVALIER | OH | D. Young | ||
| CHILDRESS | VA | E. Rogers | ||
| CHILDRESS | KY | E. Rogers | ||
| CHINN | VA | D. Frandsen | ||
| CHINN | KY | D. Frandsen | ||
| CLARK | LA | D. Marvin | ||
| CLARK | CA | D. Marvin | ||
| CLARK | MO | P. Minch | ||
| CLARK | IL | P. Minch | ||
| CLARK | TN | P. Minch | ||
| CLARKE | VA | D. Frandsen | ||
| CLARKE | KY | D. Frandsen | ||
| CLEMENTS | VA | J. Vaughn | ||
| CLEMENTS | KY | J. Vaughn | ||
| CLEMENTS | IN | J. Vaughn | ||
| CLEMENTS | IL | J. Vaughn | ||
| CLIFTON | MA | M. Rollins (Kulstad) | ||
| CLOSSON | NJ | P. Stowe | ||
| CLOSSON | OH | P. Stowe | ||
| CLOSSON | PA | P. Stowe | ||
| CLOSSON | IA | P. Stowe | ||
| CLOUD / CLOUDE | England | P. Stowe | ||
| CLOUD / CLOUDE | DE | P. Stowe | ||
| CLOUD / CLOUDE | VA | P. Stowe | ||
| CLOUD / CLOUDE | KY | P. Stowe | ||
| CLOYD / CLOYED | IA | L. Parrish | ||
| COATES / COATS | SC | B. Hagan | ||
| COBURN / COLBURN | NY | C. Stowe | ||
| COCHRAN | Ireland | J. Cupp | ||
| COCHRAN | PA | J. Cupp | ||
| COCKRUM / COCKERHAM | PA | D. Marvin | ||
| COCKRUM / COCKERHAM | CA | D. Marvin | ||
| COHEN | Ukraine | B. Brahms | ||
| COLINS | England | D. Marvin | ||
| COLINS | CA | D. Marvin | ||
| COLLAMORE | England | A. Reilly | ||
| COLLIER / COLYAR | NC | G. Gibbel | ||
| COLLIER / COLYAR | MI | G. Gibbel | ||
| COLLINS | KY | D. Nelson | ||
| COLLINS / COLLINGS | DE | D. Young | ||
| COLLINS / COLLINGS | MD | D. Young | ||
| COLVIN | VA | G. Gibbel | ||
| COLVIN | KY | G. Gibbel | ||
| COMBS / COOMBS | England | K. Brahms | ||
| COMBS / COOMBS | MA | K. Brahms | ||
| COMBS / COOMBS | CA | K. Brahms | ||
| CONGER | NJ | G. Gibbel | ||
| CONGER | NC | G. Gibbel | ||
| CONNELLY | Ireland | J. Bohnert | ||
| CONRAD | PA | A. Brunckhorst | ||
| CONRAD | IN | A. Brunckhorst | ||
| CONSEY | CA | S. Hunt | ||
| CONSEY | MD | S. Hunt | ||
| CONSEY | OH | S. Hunt | ||
| CONSEY | IN | S. Hunt | ||
| COOKE | MA | K. Sherron | ||
| COOLEY | MA | C. Stowe | ||
| COOPER | NJ | A. Reilly | ||
| COOPER | NY | A. Reilly | ||
| COOPER | MN | A. Reilly | ||
| CORNWALL | GA | N. McClellan | ||
| CORNWALL | KY | N. McClellan | ||
| CORNWALL | MO | N. McClellan | ||
| CORNWALL | AR | N. McClellan | ||
| CORNWALL | OR | N. McClellan | ||
| CORNWALL | CA | N. McClellan | ||
| CORWIN | NY | J. Simonson | ||
| CORWIN | CT | J. Simonson | ||
| CORWIN | IL | J. Simonson | ||
| COSHOW | NJ | V. Williams | ||
| COSHOW | VA | V. Williams | ||
| COSHOW | KY | V. Williams | ||
| COSHOW | IN | V. Williams | ||
| COUGHNET | NY | D. Perkins | ||
| COUGHNET | France | D. Perkins | ||
| COVGNHOVGN | NY | D. Perkins | ||
| COVGNHOVGN | NJ | D. Perkins | ||
| COVGNHOVGN | Holland | D. Perkins | ||
| COVINGTON | MD | D. Young | ||
| COVINGTON | IN | D. Young | ||
| COWAN / COWIN | NY | D. Marvin | ||
| COWDEN | Ireland | J. Simonson | ||
| COWDEN | PA | J. Simonson | ||
| COWDEN | OH | J. Simonson | ||
| COWDEN | IL | J. Simonson | ||
| CRAIN | VA | E. Rogers | ||
| CRAIN | KY | E. Rogers | ||
| CRAWFORD | KY | J. Lawson | ||
| CRAWFORD | N.Scotia | P. Minch | ||
| CRAWFORD | CA | J. Lawson | ||
| CRAWFORD | OK | D. Marvin | ||
| CREED | IL | M. Lawson | ||
| CREED | MA | M. Lawson | ||
| CRIBBS | PA | A. Rowe | ||
| CRONK | OH | D. Young | ||
| CRONK / CRANCHEYT | NY | D. Young | ||
| CROSBY | Ireland | C. Stowe | ||
| CROSBY | MA | C. Stowe | ||
| CROSS | B. Rogers | |||
| CRUSE | NC | B. Moore | ||
| CUDDEBACK/CAUDEBEC | France | A. Reilly | ||
| CUDDEBACK/CAUDEBEC | NY | A. Reilly | ||
| CULLEN | Ireland | A. Reilly | ||
| CULLEN | NY | A. Reilly | ||
| CULLEN | NJ | A. Reilly | ||
| CULLEN | IA | A. Reilly | ||
| CUMMINGS | IA | P. Stowe | ||
| CUMMINGS | CO | P. Stowe | ||
| CUMMINGS | VA | B. Hagan | ||
| CUMMINGS / COMMINS | VT | D. Young | ||
| CUMMINGS / COMMINS | OH | D. Young | ||
| CUMMINGS / COMMINS | MA | D. Young | ||
| CUPP | WVA | J. Cupp |