| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Crispin | KRIS-pin | English (Rare) | ||
| Crispinus | - | Ancient Roman | ||
| Crispus | - | Ancient Roman | ||
| Cristal | KRIS-təl | English | ||
| Cristen | KRIS-tən | English (Modern) | ||
| Crofton | KRAWF-tən | English (Rare) | ||
| Crystal | KRIS-təl | English | ||
| Cuidightheach | - | Ancient Irish | ||
| Cullen | KUL-ən | English | ||
| CunÉGonde | - | French | ||
| Cunigund | - | Ancient Germanic | ||
| Cunobelinus | kyoo-no-bə-LIEN-əs (English) | Ancient Celtic | ||
| Curt | KURT | English | ||
| Curtis | KUR-tis | English | ||
| Cuthbert | KUTH-burt | English (Rare) |