| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cato (1) | - | Ancient Roman | ||
| Celsus | - | Ancient Roman | ||
| Ceres | - | Roman Mythology | ||
| Cezar | - | Romanian, Portuguese (Brazilian) | ||
| Christiana | kris-tee-AN-ə (English) | English, Late Roman | ||
| Christianus | - | Late Roman | ||
| Christophorus | - | Late Roman | ||
| Cicero | SIS-ə-ro (English) | Ancient Roman | ||
| Ciprian | cheep-RYAHN | Romanian | ||
| Clara | KLAH-rah (Italian, German, Spanish), KLER-ə (English), KLAR-ə (English) | Italian, German, Spanish, Portuguese, Catalan, Romanian, English, Swedish, Danish, Late Roman | ||
| Claritia | - | Late Roman | ||
| Clarus | - | Late Roman | ||
| Claudia | KLAW-dee-ə (English), KLOW-dee-ah (German, Dutch), KLOW-dyah (Italian, Spanish, Romanian) | English, German, Dutch, Italian, Spanish, Romanian, Biblical, Ancient Roman | ||
| Claudiu | - | Romanian | ||
| Claudius | KLAW-dee-əs (English) | Ancient Roman |