| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Caelinus | - | Ancient Roman | ||
| Caelius | - | Ancient Roman | ||
| Caesar | SEE-zər (English) | Ancient Roman | ||
| Caesarius | - | Late Roman | ||
| Cahaya | - | Indonesian, Malay | ||
| Cahya | CHAH-yah | Indonesian | ||
| Cahyo | - | Indonesian, Javanese | ||
| Cai (1) | - | Swedish, Norwegian, Danish | ||
| Cai (2) | - | Welsh Mythology, Arthurian Romance | ||
| Caietanus | - | Late Roman | ||
| Caio | - | Portuguese (Brazilian) | ||
| Caiside | - | Ancient Irish | ||
| Caius | - | Ancient Roman | ||
| Caj | - | Swedish, Norwegian, Danish | ||
| Caja | - | Danish |