| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cuidightheach | - | Ancient Irish | ||
| CuimÍN | - | Irish | ||
| Culhwch | KEEL-hookh (Welsh) | Welsh, Welsh Mythology | ||
| Cullen | KUL-ən | English | ||
| Cumhur | - | Turkish | ||
| Curro | - | Spanish | ||
| Curt | KURT | English | ||
| Curtis | KUR-tis | English | ||
| CustÓDia | - | Portuguese | ||
| CustÓDio | - | Portuguese | ||
| Custodia | - | Spanish | ||
| Custodio | - | Spanish | ||
| Cuthberht | - | Anglo-Saxon | ||
| Cuthbert | KUTH-burt | English (Rare) | ||
| Cveta | - | Serbian |