| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cai (2) | - | Welsh Mythology, Arthurian Romance | ||
| Caiden | KAY-dən | English (Modern) | ||
| Cailean | KA-len | Scottish | ||
| Caileigh | KAY-lee | English (Rare) | ||
| Cailin | KAY-lin | English (Rare) | ||
| Cailyn | KAY-lin | English (Modern) | ||
| 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) |