| Name | Meaning | Gender | Origin |
|---|
| Carrick | From the rocky headland
| Male | |
| Carroll | Champion | Male | Anglicized |
| Carthach | Loving
| Male | |
| Carthage | Loving
| Male | |
| Cary | honest one, shy | Male | Latin |
| Case | Variant of Casey Alert: vigorous.
| Male | Word |
| Casee | Vigilant.
| Female | |
| Casey | brave, watchful | Male | Irish |
| Cassidy | Clever: Curly-headed.
| Female | Irish |
| Cathal | Battle Strong | Unisex | Irish |
| Chrissie | Anointed, Follower Of Christ | Unisex | English |
| Christy | Greek and Latin, bearer of Christ | Male | Greek |
| Ciara | black-haired | Female | Irish |
| Claire | bright, clear | Female | |
| Clancy | offspring of red-headed soldier | Male | Irish |
| Cody | Helpful.
| Male | English |
| Colin | Strong and virile; victorious army; youth, child, victor | Male | English |
| Columbo | dove | Male | Latin |
| Conan | Hound.
| Male | Irish |
| Connie | Constant, Firm | Male | English |
| Connor | lover of hounds | Male | Irish |
| Corey | raven, from the hollow | Male | Irish |
| Cornelius | horn | Male | Latin |
| Cory | from the hollow | Male | Irish |
| Dagda | | Unisex | Hebrew |