| Chuy | | - | Spanish | |
| Cintia | | THEEN-tyah (Spanish), SEEN-tyah (Latin American Spanish) | Spanish, Hungarian | |
| Cipriano | | chee-pree-AH-no (Italian) | Italian, Spanish, Portuguese | |
| CirÍAco | | - | Portuguese, Spanish | |
| Ciriaco | | chee-ree-AH-ko (Italian), thee-ree-AH-ko (Spanish), see-ree-AH-ko (Latin American Spanish) | Italian, Spanish | |
| Cirino | | chee-REE-no (Italian), thee-REE-no (Spanish), see-REE-no (Latin American Spanish) | Italian, Spanish | |
| Ciro | | CHEE-ro (Italian), THEE-ro (Spanish), SEE-ro (Latin American Spanish) | Italian, Spanish | |
| ClÍMaco | | - | Spanish | |
| Clara | | KLAH-rah (Italian, German, Spanish), KLER-ə (English), KLAR-ə (English) | Italian, German, Spanish, Portuguese, Catalan, Romanian, English, Swedish, Danish, Late Roman | |
| Clarisa | | klah-REE-sah | Spanish | |
| Clarissa | | klə-RIS-ə (English) | English, Italian, Portuguese, Spanish | |
| Claudia | | KLAW-dee-ə (English), KLOW-dee-ah (German, Dutch), KLOW-dyah (Italian, Spanish, Romanian) | English, German, Dutch, Italian, Spanish, Romanian, Biblical, Ancient Roman | |
| Claudio | | KLOW-dyo | Italian, Spanish | |
| Clemente | | kle-MEN-te (Italian, Spanish) | Italian, Spanish, Portuguese | |
| Clementina | | kle-men-TEE-nah (Italian, Spanish), klə-mən-TEE-nə (Portuguese) | Italian, Spanish, Portuguese | |