| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 341 | Corley | Irish | Variant of Corey 'Hill hollow.'. | M | |
| 342 | Cormac | Irish | Charioteer. | M | |
| 343 | Cormack | Irish | Variant of Cormac 'raven's son.'. | M | |
| 344 | Cormic | Irish | Charioteer. | M | |
| 345 | Cormick | Irish | Charioteer. Variant of Cormac 'raven's son.'. | M | |
| 346 | Cornelius | Irish | Strong willed or wise. Cornelius is sometimes used as a translation of the name Conchubhar meaning High Desire. | M | |
| 347 | Corney | Irish | Diminutive of Cornelius: Strong willed or wise. Cornelius is sometimes used as a translation of the name Conchubhar meaning High Desire. | M | |
| 348 | Corran | Irish | Spear-bearer. | M | |
| 349 | Corren | Irish | Spear-bearer. | M | |
| 350 | Correy | Irish | Variant of Corey 'Hill hollow.'. | M | |
| 351 | Corrick | Irish | Variant of Corey 'Hill hollow.'. | M | |
| 352 | Corrin | Irish | Spear-bearer. | M | |
| 353 | Cory | Irish | From the round hill. | M | |
| 354 | Cosgrave | Irish | Variant of Cosgrove: Triumphant. | M | |
| 355 | Cosgrove | Irish | Triumphant. | M | |
| 356 | Costello | Irish | Surname. | M | |
| 357 | Coughlan | Irish | Hooded. | M | |
| 358 | Covey | Irish | Hound of the plains. | M | |
| 359 | Cowan | Irish | Valley in a hill; twin. | M | |
| 360 | Cowen | Irish | Twin. | M | |