| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| CÉSar | THE-sahr (Spanish), SE-sahr (Latin American Spanish) | French, Spanish, Portuguese | ||
| CÔMe | - | French | ||
| Cadeyrn | - | Ancient Celtic | ||
| Caecilia | - | German, Ancient Roman | ||
| Caecilius | - | Ancient Roman | ||
| Caelia | - | Ancient Roman | ||
| Caelina | - | Ancient Roman | ||
| Caelinus | - | Ancient Roman | ||
| Caelius | - | Ancient Roman | ||
| Caesar | SEE-zər (English) | Ancient Roman | ||
| Cai (2) | - | Welsh Mythology, Arthurian Romance | ||
| Caiaphas | KAY-ə-fəs (English), KIE-ə-fəs (English) | Biblical | ||
| Cailean | KA-len | Scottish | ||
| Cain | KAYN (English) | Biblical, Biblical Latin | ||
| Cainan | KAY-nən (English), kay-IE-nən (English) | Biblical, Biblical Latin |