| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 361 | Cowyn | Irish | Twin. | M | |
| 362 | Coyle | Irish | Soldier; leader in battle. | M | |
| 363 | Creedon | Irish | A surname meaning 'Belief; guiding principle.'. | M | |
| 364 | Crevan | Irish | Fox. | M | |
| 365 | Crogher | Irish | Loves hounds. | M | |
| 366 | Crohoore | Irish | Loves hounds. | M | |
| 367 | Cronan | Irish | Little dark one. | M | |
| 368 | Crowley | Irish | Hunch backed. | M | |
| 369 | Cruadhlaoich | Irish | Hunch backed. | M | |
| 370 | Cuanaic | Irish | Handsome. | M | |
| 371 | Cuilean | Irish | Variant of Coilean: Puppy. | M | |
| 372 | Cuinn | Irish | Wise; intelligent. | M | |
| 373 | Cullan | Irish | Good-looking lad. Also a variant of Cullent: Holly. | M | |
| 374 | Cullen | Irish | Good-looking lad. Surname. | M | |
| 375 | Cullent | Irish | Holly. | M | |
| 376 | Cullin | Irish | Good-looking lad. Also a variant of Cullent: Holly. | M | |
| 377 | Cullo | Irish | Hound of Ulster. | M | |
| 378 | Cully | Irish | Diminutive of Cullent: Holly. | M | |
| 379 | Cumhea | Irish | Hound of the plains. | M | |
| 380 | Curran | Irish | Hero. | M | |