| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| CÁEl | - | Irish Mythology | ||
| CÁIt | KAHT, KOIT, KAYT | Irish | ||
| CÁRthach | - | Irish | ||
| CÉIbhfhionn | - | Irish Mythology | ||
| CÓEmgein | KEE-veen, KWEE-vin | Irish | ||
| CÚChulainn | - | Irish Mythology | ||
| Cadogan | - | Welsh, Irish | ||
| Cahal | - | Irish | ||
| Cahir | - | Irish | ||
| Cainneach | - | Irish | ||
| Cairbre | KAHR-bra | Irish, Scottish | ||
| Caiside | - | Ancient Irish | ||
| CaitlÍN | KAHT-leen | Irish | ||
| Caitlin | KAHT-leen (Irish), KAYT-lin (English) | Irish, English | ||
| CaitrÍOna | kah-TREE-na | Irish |