| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Caesarius | - | Late Roman | ||
| Caietanus | - | Late Roman | ||
| Calixtus | - | Late Roman | ||
| Callistus | kə-LIS-təs (English) | Late Roman | ||
| Callixtus | - | Late Roman | ||
| Calogerus | - | Late Roman | ||
| Candida | KAN-di-də (English) | Late Roman, English | ||
| Candidus | - | Late Roman | ||
| Carina (1) | kə-REEN-ə (English), kah-REE-nah (German) | English, Portuguese, Spanish, German, Late Roman | ||
| Christiana | kris-tee-AN-ə (English) | English, Late Roman | ||
| Christianus | - | Late Roman | ||
| Christophorus | - | Late Roman | ||
| Clara | KLAH-rah (Italian, German, Spanish), KLER-ə (English), KLAR-ə (English) | Italian, German, Spanish, Portuguese, Catalan, Romanian, English, Swedish, Danish, Late Roman | ||
| Claritia | - | Late Roman | ||
| Clarus | - | Late Roman |