| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 281 | Cuinn | Gaelic | Wise. | M | |
| 282 | Cullan | Gaelic | Handsome. | M | |
| 283 | Cullen | Gaelic | Handsome; good-looking lad. | M | |
| 284 | Culley | Gaelic | Dwells at the woodland. | M | |
| 285 | Cullin | Gaelic | Variant of Cullen: Handsome; good-looking lad. | M | |
| 286 | Cully | Gaelic | Handsome or dwells at the woodland. | M | |
| 287 | Cunningham | Gaelic | Village that has a milk pail. | M | |
| 288 | Curadhan | Gaelic | Hero. | M | |
| 289 | Curney | Gaelic | Hero. | M | |
| 290 | Curr | Gaelic | Hero. | M | |
| 291 | Curran | Gaelic | Hero; Dagger. | M | |
| 292 | Currie | Gaelic | Dagger. | M | |
| 293 | Curry | Gaelic | Dagger. | M | |
| 294 | Dace | Gaelic | Diminutive of Dacey: From the south. | M | |
| 295 | Dacey | Gaelic | Southerner. | M | |
| 296 | Dacia | Gaelic | Variant of Dacey: From the south. | M | |
| 297 | Dacian | Gaelic | Variant of Dacey: From the south. | M | |
| 298 | Dacy | Gaelic | Southerner. | M | |
| 299 | Daeg | Gaelic | Black-haired. | M | |
| 300 | Daegan | Gaelic | Black-haired. | M | |