| Cadhla | Woman | Irish Names |
| Cáel | Unisex | Irish Names |
| Caelan | Unisex | Irish Names |
| Cagney | Unisex | Irish Names |
| Caine | Man | Irish Names |
| Cairbre | Man | Irish Names |
| Cait | Woman | Irish Names |
| Caitlin | Woman | Irish Names |
| Caitlyn | Woman | Irish Names |
| Caitríona | Woman | Irish Names |
| Calbhach | Man | Irish Names |
| Callahan | Man | Irish Names |
| Callan | Unisex | Irish Names |
| Callen | Unisex | Irish Names |
| Calvagh | Man | Irish Names |
| Caoimhe | Woman | Irish Names |
| Caoimhín | Man | Irish Names |
| Caolan | Man | Irish Names |
| Carey | Unisex | Irish Names |
| Cargan | Man | Irish Names |