| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Brighid | BRIED | Irish, Irish Mythology | ||
| Brigid | - | Irish, Irish Mythology | ||
| Brigit | - | Irish Mythology | ||
| Brogan | - | Irish | ||
| Bronagh | - | Irish | ||
| 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 |