| Name | Meanings | Gender | Origin |
|---|---|---|---|
| Caley | Slender | Boy | Gaelic |
| Carrick | Dweller on the rocky cape | Boy | Gaelic |
| Cassidy | Clever | Boy | Gaelic |
| Catriona | Pure | Girl | Gaelic |
| Cavan | Handsome | Boy | Gaelic |
| Cian | Ancient | Boy | Gaelic |
| Colleen | Girl | Girl | Gaelic |
| Collin | Form of COLIN - victor | Boy | Gaelic |
| Colm | Dove | Boy | Gaelic |
| Conlan | Hero | Boy | Gaelic |
| Conor | Form of CONNOR - wise aid | Boy | Gaelic |
| Corcoran | Of reddish complexion | Boy | Gaelic |
| Corey | Raven | Boy | Gaelic |
| Craig | Rock, crag | Boy | Gaelic |
| Creighton | Near the creek | Boy | Gaelic |
| Curran | Hero | Boy | Gaelic |
| Curry | A marsh or an herb | Boy | Gaelic |