| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 241 | Coinneach | Gaelic | Handsome. | M | |
| 242 | Coire | Gaelic | Ravine. | M | |
| 243 | Colan | Gaelic | Child. | M | |
| 244 | Coleen | Gaelic | Girl. | F | |
| 245 | Colin | Gaelic | Child or virile. | M | |
| 246 | Coll | Gaelic | Child. | M | |
| 247 | Collan | Gaelic | Variant of Cullen: Handsome; good-looking lad. | M | |
| 248 | Colle | Gaelic | Dwells at the woodland. | M | |
| 249 | Colleen | Gaelic | Girl. | F | |
| 250 | Collin | Gaelic | Child. | M | |
| 251 | Colm | Gaelic | Servant of Saint Columba. | M | |
| 252 | Colum | Gaelic | Dove. | M | |
| 253 | Columbanus | Gaelic | Dove. | M | |
| 254 | Comhghan | Gaelic | Twin. | M | |
| 255 | Con | Gaelic | Exalted. | F | |
| 256 | Conaire | Gaelic | Wise. | M | |
| 257 | Conlan | Gaelic | Hero. | M | |
| 258 | Conlin | Gaelic | Hero. | M | |
| 259 | Connlan | Gaelic | Hero. | M | |
| 260 | Conroy | Gaelic | Wise. | M | |