| Claudin | Derived from Latin, meaning 'lame' or 'crippled' |
| Clauds | Derived from Latin, meaning 'lame' or 'crippled' |
| Clavance | Derived from Old French, meaning 'of the key' or 'key holder' |
| Clavin | Derived from the Latin for bald. |
| Clen | Possibly derived from Old English, meaning 'narrow' or 'slender' |
| Clessy | Possibly derived from Old English, meaning 'clever' or 'skilled' |
| Cleton | Possibly derived from Old English, meaning 'clever' or 'skilled' |
| Clevan | A variant of the name Cleve. |
| Cleven | One who lives near a cliff. |
| Clochides | Derived from Greek, meaning 'of the cloak' or 'cloak wearer' |
| Clodwal | Derived from Old English, meaning 'famous ruler' or 'renowned leader' |
| Clotuali | Derived from Old English, meaning 'famous ruler' or 'renowned leader' |
| Clutarigas | Derived from Old English, meaning 'famous warrior' or 'renowned fighter' |
| Clvtori | Possibly derived from Latin, meaning 'of the forest' or 'forest dweller' |
| Clvtorigi | Derived from Old English, possibly meaning 'clever origin' or 'clever birth' |
| Clyton | Clay Settlement |
| Cnapa | Old English name, possibly meaning 'battle' or 'warrior' |
| Cnebba | Old English name, possibly meaning 'bright' or 'shining' |
| Cobie | Diminutive form of Robert, meaning 'bright fame' |
| Cobreigen | Old English name, possibly meaning 'bright ruler' or 'shining lord' |
| Cocca | Old English name, possibly meaning 'curly-haired' or 'ringed' |
| Coelfrid | Old English name, possibly meaning 'elf peace' or 'elf friend' |
| Coeman | Old English name, possibly meaning 'people's ruler' or 'common lord' |
| Coenhelm | Old English name, possibly meaning 'people's helmet' or 'common protection' |
| Coenred | Old English name, possibly meaning 'people's counsel' or 'common advice' |
| Coenwalh | Old English name, possibly meaning 'people's ruler' or 'common lord' |
| Cofa | Old English name, possibly meaning 'calf' or 'young bull' |
| Cofsi | Old English name, possibly meaning 'battle victory' or 'warrior's triumph' |
| Cohha | Old English name, possibly meaning 'battle' or 'warrior' |
| Coifi | Old English name, possibly meaning 'battle' or 'warrior' |
| Coilbrit | Old English name, possibly meaning 'battle Briton' or 'warrior of Britain' |
| Coimagni | Old English name, possibly meaning 'battle mighty' or 'warrior strong' |
| Coimagnus | Old English name, possibly meaning 'battle great' or 'warrior powerful' |
| Coineus | Old English name, possibly meaning 'battle noble' or 'warrior noble' |
| Colea | Swarthy; Black; Black-haired |
| Collen | Victorious People; Hazel Tree |
| Collibe | Old English name, possibly meaning 'battle people' or 'warrior's tribe' |
| Collye | Diminutive form of Colin, meaning 'pup' or 'young dog' |
| Comm | A short form of common names. |
| Commius | Latin name meaning 'of the people' or 'public' |