| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cyneheard | - | Anglo-Saxon | ||
| Cynem&Aelig;R | - | Anglo-Saxon | ||
| Cyneric | - | Anglo-Saxon | ||
| Cynesige | - | Anglo-Saxon | ||
| Cyneweard | - | Anglo-Saxon | ||
| Cynthia | SIN-thee-ə (English) | English, Greek Mythology (Latinized) | ||
| Cyprian | SIP-ree-ən (English) | History | ||
| Cyra | - | History | ||
| Cyril | SIR-əl (English), SEER-əl (English), TSI-ril (Czech) | English, French, Czech, Slovak | ||
| Cyrilla | - | English (Rare) | ||
| Cyrus | SIE-rəs (English) | English, Biblical, Biblical Latin, Ancient Greek (Latinized) | ||
| Cyryl | TSI-ril | Polish | ||
| Cystennin | - | Welsh | ||
| Czcibor | - | Polish | ||
| CzesŁAw | CHES-wahf | Polish |