| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cosmas | - | Ancient Greek (Latinized) | ||
| Crius | - | Greek Mythology (Latinized) | ||
| Cronus | KRO-nəs (English) | Greek Mythology (Latinized) | ||
| Cynthia | SIN-thee-ə (English) | English, Greek Mythology (Latinized) | ||
| Cyrillus | - | Ancient Greek (Latinized) | ||
| Cyrus | SIE-rəs (English) | English, Biblical, Biblical Latin, Ancient Greek (Latinized) |