| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cyndi | SIN-dee | English | ||
| Cynthia | SIN-thee-ə (English) | English, Greek Mythology (Latinized) | ||
| Cynwrig | - | Ancient Celtic | ||
| Cyprianus | - | Ancient Roman | ||
| Cyrielle | - | French | ||
| Cyril | SIR-əl (English), SEER-əl (English), TSI-ril (Czech) | English, French, Czech, Slovak | ||
| Cyrilla | - | English (Rare) | ||
| Cyrille | see-REEL | French | ||
| Cyrillus | - | Ancient Greek (Latinized) | ||
| Cyrus | SIE-rəs (English) | English, Biblical, Biblical Latin, Ancient Greek (Latinized) |