| Cristiana | | kree-STYAH-nah (Italian) | Italian, Portuguese | |
| Cristiano | | kree-STYAH-no (Italian), kreesh-TYA-noo (Portuguese) | Italian, Portuguese | |
| Cristina | | kree-STEE-nah (Italian, Spanish) | Italian, Spanish, Portuguese, Romanian | |
| Cristoforo | | - | Italian | |
| Crius | | - | Greek Mythology (Latinized) | |
| Crocetta | | kro-CHET-tah | Italian | |
| Crocifissa | | kro-chee-FEE-sah | Italian | |
| Crofton | | KRAWF-tən | English (Rare) | |
| Cronus | | KRO-nəs (English) | Greek Mythology (Latinized) | |
| Cruz | | KROOTH (Spanish), KROOS (Latin American Spanish), KROOSH (Portuguese) | Spanish, Portuguese | |
| Cruzita | | kroo-THEE-tah (Spanish), kroo-SEE-tah (Latin American Spanish) | Spanish | |
| Csaba | | CHAW-baw | Hungarian | |
| Csenge | | CHENG-ge | Hungarian | |
| Csilla | | CHEEL-law | Hungarian | |
| Ctirad | | - | Czech, Slovak | |