| Caesar | | SEE-zər (English) | Ancient Roman | |
| Caesarius | | - | Late Roman | |
| Caetlin | | KAYT-lin | English (Rare) | |
| Cahaya | | - | Indonesian, Malay | |
| Cahya | | CHAH-yah | Indonesian | |
| Cahyo | | - | Indonesian, Javanese | |
| Cai (1) | | - | Swedish, Norwegian, Danish | |
| Cai (2) | | - | Welsh Mythology, Arthurian Romance | |
| Caiaphas | | KAY-ə-fəs (English), KIE-ə-fəs (English) | Biblical | |
| Caietanus | | - | Late Roman | |
| Caileigh | | KAY-lee | English (Rare) | |
| Cailin | | KAY-lin | English (Rare) | |
| Cain | | KAYN (English) | Biblical, Biblical Latin | |
| Cainan | | KAY-nən (English), kay-IE-nən (English) | Biblical, Biblical Latin | |
| Caio | | - | Portuguese (Brazilian) | |