| Name | Meaning | Gender | Origin |
|---|
| Cilla | after the singer Cilla Black | Female | English |
| Cinder | | Unisex | Hebrew |
| Cindy | Abbreviation of Cynthia and Lucinda.
| Female | English |
| Cinnabar | | Female | Hebrew |
| Cinnamon | | Female | Hebrew |
| Citrine | | Unisex | Hebrew |
| Citron | lemon | Female | |
| Clancy | offspring of red-headed soldier | Male | Irish |
| Clara | bright, clear | Female | Latin |
| Claret | A dry red wine | Female | Color |
| Clementine | mild, merciful | Female | |
| Clifford | Lives by the ford near the cliff
| Male | English |
| Clorox | | Unisex | Hebrew |
| Cloud | | Male | Hebrew |
| Cloudy | | Male | Hebrew |
| Clove | Spice | Male | German |
| Clover | Clover
| Female | |
| Cobalt | | Male | Hebrew |
| Coby | Supplanter, Representative | Male | English |
| Coco | A pet name.
| Female | Spanish |
| Coco | A pet name.
| Female | Spanish |
| Coco | A pet name.
| Female | Spanish |
| Cocoa | cocoa Jumbo | Female | Color |
| Coconut | Edible white flesh of the coconut palm tree. | Unisex | |
| Coffee | | Unisex | Hebrew |