| Name | Meaning | Gender | Origin |
|---|
| Cinda | Girl By The Cinders | Female | Latin |
| Cinderella | little ash-girl | Female | |
| Cira | Sun | Unisex | Italian |
| Circe | witch-goddess, seductive | Female | Greek |
| Claire | bright, clear | Female | |
| Clara | bright, clear | Female | Latin |
| Clarice | Latin, bright, clear | Female | English |
| Clarissa | bright, clear | Female | Latinized |
| Clarke | Clergyman, Scholar | Unisex | English |
| Claudine | Feminine of Claude.
| Female | |
| Clementine | mild, merciful | Female | |
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cliff | From Clifford - From the ford by the cliff. | Unisex | |
| Clio | praise, muse of history | Female | Greek |
| Clover | Clover
| Female | |
| Colette | victory of the people | Female | |
| Colonel | Army, Air Force or Marine officer ranked above Lieutenant but below Brigadier. | Unisex | |
| Conner | desire, wise aid, wolf-lover | Unisex | |
| Constance | steadfastness | Female | English |
| Contessa | | Unisex | Hebrew |
| Corazon | Heart | Unisex | Filipino |
| Cordelia | In Shakespeare's King Lear a woman of rare honesty.
| Female | Latin |
| Creed | Creed | Unisex | English |
| Creola | named for the Jimmy Buffett song | Unisex | |