| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cai (2) | - | Welsh Mythology, Arthurian Romance | ||
| CecÍLia | - | Portuguese, Slovak, Hungarian | ||
| Cili | - | Hungarian | ||
| Cintia | THEEN-tyah (Spanish), SEEN-tyah (Latin American Spanish) | Spanish, Hungarian | ||
| Citlali | - | Native American, Nahuatl | ||
| Csaba | CHAW-baw | Hungarian | ||
| Csenge | CHENG-ge | Hungarian | ||
| Csilla | CHEEL-law | Hungarian | ||
| CuauhtÉMoc | - | Native American, Nahuatl |