| Gender | Baby Name | Meaning |
|---|---|---|
 | Cianna | Ancient |
| Ciara | Black |
 | Ciaran | Black |
| Cillian | Little warrior |
| Cliona | Shapely |
| Clodagh | Name of an Irish river |
| Collice | Girl |
| Colum | Dove |
| Conan | Hound |
| Conlan | Hero |
| Conley | Great chief |
| Connell | Wolf |
| Conner | Hound lover |
| Connley | Great chief |
| Connor | Hound lover |
| Conor | Hound lover |
| Conroy | Wise man |
| Conway | Yellow Hound |
| Corey | Hollow |
| Cory | Hollow |
| Crevan | Fox |
| Cullen | Handsome |
| Cunningham | Descendant of the chief |
| Daire | Fruitful, Fertile |
| Darcy | Dark One |
| Darien | Wealthy |
| Darina | Fertile, fruitful |
| Darra | Fruitful, fertile |
| Darrah | Fertile; fruitful |
| Darren | Wealthy |
