| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Crispus | - | Ancient Roman | ||
| Ctibor | - | Czech | ||
| Ctirad | - | Czech, Slovak | ||
| CuauhtÉMoc | - | Native American, Nahuatl | ||
| Cuidightheach | - | Ancient Irish | ||
| CunÉGonde | - | French | ||
| Cunigund | - | Ancient Germanic | ||
| Cunobelinus | kyoo-no-bə-LIEN-əs (English) | Ancient Celtic | ||
| Cvijeta | TSVEE-e-tah | Croatian, Serbian | ||
| Cvita | TSVEE-tah | Croatian | ||
| Cynbel | - | Ancient Celtic | ||
| Cynwrig | - | Ancient Celtic | ||
| Cyprianus | - | Ancient Roman | ||
| Cyrielle | - | French | ||
| Cyril | SIR-əl (English), SEER-əl (English), TSI-ril (Czech) | English, French, Czech, Slovak |