| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| CAIN | KAYN (English) | Biblical, Biblical Latin | ||
| CAINAN | KAY-nən (English), kay-IE-nən (English) | Biblical, Biblical Latin | ||
| CAINNEACH | - | Irish | ||
| CAIO | - | Portuguese (Brazilian) | ||
| CAIRBRE | KAHR-bra | Irish, Scottish | ||
| CAIRISTÌONA | - | Scottish | ||
| CAIRO | KIE-ro | English (Rare) | ||
| CAISIDE | - | Ancient Irish | ||
| CAITLÍN | KAHT-leen | Irish | ||
| CAITLIN | KAHT-leen (Irish), KAYT-lin (English) | Irish, English | ||
| CAITLYN | KAYT-lin | English (Modern) | ||
| CAITRÍONA | kah-TREE-na | Irish | ||
| CAITRÌONA | - | Scottish | ||
| CAITRIA | - | Irish | ||
| CAIUS | - | Ancient Roman |