| Name | Meaning | Gender | Origin |
|---|
| Circe | witch-goddess, seductive | Female | Greek |
| Clarice | Latin, bright, clear | Female | English |
| Claudia | Feminine of Claude.
| Female | Latin |
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cleo | From Cleopatra - Her father's glory | Female | Greek |
| Cobweb | | Unisex | Hebrew |
| Coco | A pet name.
| Female | Spanish |
| Coco | A pet name.
| Female | Spanish |
| Coco | A pet name.
| Female | Spanish |
| Cosmic | | Unisex | Hebrew |
| Crimson | A deep of vivid red colour. | Female | Color |
| Crowley | Hunch-Backed | Unisex | Irish |
| Cruella | | Unisex | Hebrew |
| Crystal | Variant of Christiana. Follower of Christ.
| Female | |
| Crystal | Variant of Christiana. Follower of Christ.
| Female | |
| Cujo | | Unisex | Hebrew |
| Dahlia | Flower Named For Botanist A. Dahl | Female | Greek |
| Damien | Calm, Tame | Unisex | French |
| Daphne | laurel, bay tree, victory | Female | Greek |
| Darkie | | Unisex | Hebrew |
| Darryl | Of Airelle, France | Unisex | English |
| Darth | | Unisex | Hebrew |
| Dee | Dark | Unisex | Welsh |
| Demon | | Unisex | |
| Demon | | Unisex | |