| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 221 | Charraigaich | Gaelic | Rocky headland. | M | |
| 222 | Choilleich | Gaelic | Guards the forest. | M | |
| 223 | Cian | Gaelic | Ancient. | M | |
| 224 | Ciarda | Gaelic | Dark. | F | |
| 225 | Ciardubhan | Gaelic | Little black one. | M | |
| 226 | Cinnard | Gaelic | From the high hill. | M | |
| 227 | Cinneididh | Gaelic | Helmeted. | M | |
| 228 | Cinnfhail | Gaelic | From the head of the cliff. | M | |
| 229 | Ciorstag | Gaelic | Christian. | F | |
| 230 | Ciorstan | Gaelic | Christian. | F | |
| 231 | Cleary | Gaelic | Scholar. | M | |
| 232 | Cleirach | Gaelic | Scholar. | M | |
| 233 | Clunainach | Gaelic | From the meadow. | M | |
| 234 | Cluny | Gaelic | From the meadow. | M | |
| 235 | Cobhan | Gaelic | Dwells by the hillside hollow. | M | |
| 236 | Coigleach | Gaelic | Distaff. | M | |
| 237 | Coilin | Gaelic | Virile. | M | |
| 238 | Coillcumhann | Gaelic | From the narrow forest. | M | |
| 239 | Coilleach | Gaelic | Guards the forest. | M | |
| 240 | Coinleain | Gaelic | Shaped as a well. | M | |