| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Cahal | Celtic | Strong in battle. | M | |
| 122 | Cairbre | Celtic | Charioteer. | M | |
| 123 | Calder | Celtic | From the stony river. | M | |
| 124 | Calum | Celtic | Dove. | M | |
| 125 | Camero | Celtic | Crooked nose. | M | |
| 126 | Cameron | Celtic | Crooked nose. Nickname of a Highland chieftain with a crooked nose. | M | |
| 127 | Camey | Celtic | Crooked nose. | M | |
| 128 | Caoimhghin | Celtic | Gentle. | M | |
| 129 | Car | Celtic | Fighter. | M | |
| 130 | Caradoc | Celtic | Dearly loved. | M | |
| 131 | Carbry | Celtic | Charioteer. | M | |
| 132 | Cardew | Celtic | From the black fort. | M | |
| 133 | Carew | Celtic | From the fortress. | M | |
| 134 | Carey | Celtic | From the fortress. | M | |
| 135 | Carney | Celtic | Fighter. | M | |
| 136 | Carr | Celtic | Fighter. | M | |
| 137 | Carrington | Celtic | Place name and surname. | M | |
| 138 | Carrol | Celtic | Champion. | M | |
| 139 | Carroll | Celtic | Champion. | M | |
| 140 | Cary | Celtic | From the fortress. | M | |