| 739 | CAPEL | St. Columb Major | 1600-1850 | |||||
| 373 | CARSON | Truro/Ireland | c1800s | |||||
| 357 | CLIFT | Landulph | 1750-1850 | |||||
| 205 | CLOW | Lanarkshire | All | |||||
| 303 | COCK | Bodmin | 1650-1800 | |||||
| 445 | COCK | Perranzabuloe | pre1750 | |||||
| 661 | COCK | Lanteglos by Camelford | c1800s | |||||
| 706 | COCK | St. Just in Penwith | 1600-1630 | |||||
| 303 | COCKIN(G) | Bodmin | 1750-1850 | |||||
| 211 | COLEMAN | Altarnun | c1860s | |||||
| 028 | COLENSO | Gwinear | 1700+ | |||||
| 028 | COLLECT (William) | Cornwall | c1780+ | |||||
| 028 | COLLECT + var. | Cornwall | c1700s | |||||
| 510 | COLLECT | Ruan Lanihorne | c1750 | |||||
| 028 | COLLICOAT | St. Wenn | 1750+ | |||||
| 028 | COLLICOTT | St. Wenn | 1750+ | |||||
| 600 | COLLINS | Constantine / Helston | 1600-2002 | |||||
| 600 | COLLINS | Wendron | 1600-2002 | |||||
| 551 | CONGDON | Lansallos | 18C | |||||
| 205 | CONSTABLE | Thanet, Kent | c1600 | |||||
| 666 | COOK | Lanteglos by Camelford | 18-19c | |||||
| 453 | COOMBE | East Stonehouse, Devon | c1850s | |||||
| 453 | COOMBE(S) | Cremyll / Maker | 1840+ | |||||
| 453 | COOMBE(S) | Millbrook | 1840+ | |||||
| 453 | COOMBE(S) | Gorran | 18-19C | |||||
| 453 | COOMBE(S) | Stoke Climsland | 1760-1860 | |||||
| 205 | COOPER | Marston Moretaine | c1650 | |||||
| 205 | COPPIN | Margate, Kent | c1630 | |||||
| 592 | CORNISH | Penzance | pre19C | |||||
| 626 | CORNISH (James) | Germoe | c1725 | |||||
| 656 | CORNISH | Gunwalloe | 1750-1850 | |||||
| 666 | CORNISH | Moretonhampstead | 18C | |||||
| 666 | CORNISH | Lanteglos by Camelford | 19C | |||||
| 605 | CORYN | Cornwall | All | |||||
| 605 | CORYTON | Cornwall | All | |||||
| 028 | COUMBS | Altarnun | c1600s | |||||
| 195 | COUTTS | Aberdeen, Scotland | pre1780 | |||||
| 052 | COVENTRY (John) | Rangeworthy, Somerset | c1793 | |||||
| 052 | COVENTRY (Samuel) | Rangeworthy, Somerset | c1755 | |||||
| 052 | COVENTRY (William) | Rangeworthy, Somerset | c1721 | |||||
| 028 | COWLING | Warleggan / St. Neot | 1600-1700s | |||||
| 540 | COWLING (John) | St. Agnes | c1770 | |||||
| 578 | COWLING | St. Teath / Lesnewth | pre1775 | |||||
| 367 | COWLINGS | Kea | 19C | |||||
| 205 | CRADDOCK | Chatham / Sheerness | pre1822 | |||||
| 205 | CRAFT | Northill, Bedfordshire | 1560+ | |||||
| 726 | CRAZE | Illogan | pre1860s | |||||
| 737 | CRAZE + var. | Illogan | All | |||||
| 445 | CREGO | Gerrans | 1600-1684 | |||||
| 605 | CREGOE | Gerrans | All | |||||
| 699 | CREWS | Philleigh | 1840+ | |||||
| 699 | CREWES + var. | Philleigh | 1840+ | |||||
| 510 | CROCKER | Looe | All | |||||
| 570 | CROCKER | Mevagissey / St. Ewe | 1800+ | |||||
| 570 | CROCKER | St. Austell | 1800+ | |||||
| 205 | CROSSLEY | Haynes, Bedfordshire | 1600+ | |||||
| 224 | CROTHERS (John) | Illogan / Stoke Damerel | 1750+ | |||||
| 702 | CROWLE | Kenwyn / Truro | 1750-1900 | |||||
| 205 | CROXTON | Buckinghamshire | 1600+ | |||||
| 205 | CULMER | Margate, Kent | 1500+ | |||||
| 205 | CURLING | Margate, Kent | c1500 | |||||
| 150 | CURNOW | Breage | All | |||||
| 667 | CURNOW | St. Just in Penwith | pre1851 | |||||
| 667 | CURNOW | Bosorne | pre1851 | |||||
| 719 | CURNOW + var | Gwennap | c1827 | |||||