| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 181 | Conlan | Gaelic | Hero. | M | |
| 182 | Conlin | Gaelic | Hero. | M | |
| 183 | Connlan | Gaelic | Hero. | M | |
| 184 | Conroy | Gaelic | Wise. | M | |
| 185 | Conway | Gaelic | Hound of the plain. | M | |
| 186 | Corcoran | Gaelic | Reddish skinned. | M | |
| 187 | Corcurachan | Gaelic | Reddish skinned. | M | |
| 188 | Corey | Gaelic | Ravine. | M | |
| 189 | Cori | Gaelic | Ravine. | M | |
| 190 | Cormac | Gaelic | Charioteer. Famous bearer, a legendary third century Irish king. | M | |
| 191 | Cormack | Gaelic | Charioteer. | M | |
| 192 | Cormick | Gaelic | Charioteer. | M | |
| 193 | Corwin | Gaelic | From beyond the hill. | M | |
| 194 | Corwyn | Gaelic | From beyond the hill. | M | |
| 195 | Coty | Gaelic | Ravine. | M | |
| 196 | Cowan | Gaelic | Dwells by the hillside hollow. | M | |
| 197 | Coyle | Gaelic | Searches for battle. | M | |
| 198 | Craig | Gaelic | Dwells at the Crag. | M | |
| 199 | Creag | Gaelic | Dwells at the Crag. | M | |
| 200 | Criostoir | Gaelic | Christ bearer. | M | |