| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 161 | Cluny | Gaelic | From the meadow. | M | |
| 162 | Cobhan | Gaelic | Dwells by the hillside hollow. | M | |
| 163 | Coigleach | Gaelic | Distaff. | M | |
| 164 | Coilin | Gaelic | Virile. | M | |
| 165 | Coillcumhann | Gaelic | From the narrow forest. | M | |
| 166 | Coilleach | Gaelic | Guards the forest. | M | |
| 167 | Coinleain | Gaelic | Shaped as a well. | M | |
| 168 | Coinneach | Gaelic | Handsome. | M | |
| 169 | Coire | Gaelic | Ravine. | M | |
| 170 | Colan | Gaelic | Child. | M | |
| 171 | Colin | Gaelic | Child or virile. | M | |
| 172 | Coll | Gaelic | Child. | M | |
| 173 | Collan | Gaelic | Variant of Cullen: Handsome; good-looking lad. | M | |
| 174 | Colle | Gaelic | Dwells at the woodland. | M | |
| 175 | Collin | Gaelic | Child. | M | |
| 176 | Colm | Gaelic | Servant of Saint Columba. | M | |
| 177 | Colum | Gaelic | Dove. | M | |
| 178 | Columbanus | Gaelic | Dove. | M | |
| 179 | Comhghan | Gaelic | Twin. | M | |
| 180 | Conaire | Gaelic | Wise. | M | |