| Name | Meaning | Gender | Origin |
|---|
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cleopatra | glory of the father | Female | Greek |
| Cliff | From Clifford - From the ford by the cliff. | Unisex | |
| Clio | praise, muse of history | Female | Greek |
| Columbia | a dove | Female | Latin |
| Connie | Constant, Firm | Male | English |
| Conrad | brave counsel | Male | |
| Constantine | steadfast | Male | Latin |
| Cordelia | In Shakespeare's King Lear a woman of rare honesty.
| Female | Latin |
| Cornelius | horn | Male | Latin |
| Cosette | little thing | Female | |
| Cosmo | Order, universe.
| Male | Italian |
| Cressida | gold | Female | Greek |
| Curly | Having curls or wavy hair. | Unisex | |
| Curtis | courteous, polite | Male | |
| Cymbeline | Shakespearean play, rhymes with thin - and - lean | Male | Celtic |
| Daisy | Day's eye. A flower name.
| Female | |
| Daisy | Day's eye. A flower name.
| Female | |
| Dallas | Dwells by the waterfall
| Male | Place-name |
| Danny | God Is My Judge | Unisex | English |
| Dario | Rich
| Male | Italian |
| Dave | David's son
| Male | Short |
| Demeter | earth mother | Female | Greek |
| Demetrius | lover of the earth, given to the Earth goddess | Male | Greek |