| Calvus | | - | Ancient Roman | |
| Camelia | | kah-MEL-yah | Romanian | |
| Camilla | | kə-MIL-ə (English), kah-MEEL-lah (Italian, Danish), KAH-meel-lah (Finnish) | English, Italian, Danish, Swedish, Norwegian, Finnish, German, Ancient Roman, Roman Mythology | |
| Camillus | | kə-MIL-əs (English) | Ancient Roman | |
| Candida | | KAN-di-də (English) | Late Roman, English | |
| Candidus | | - | Late Roman | |
| Cardea | | - | Roman Mythology | |
| Carina (1) | | kə-REEN-ə (English), kah-REE-nah (German) | English, Portuguese, Spanish, German, Late Roman | |
| Carmen | | KAHR-men (Spanish), KAHR-mən (English) | Spanish, English, Italian, Romanian | |
| Carol (2) | | - | Romanian | |
| Cassia | | KA-shə (English) | Ancient Roman | |
| Cassian | | KASH-ən (English) | Ancient Roman (Anglicized) | |
| Cassianus | | - | Ancient Roman | |
| Cassius | | KASH-əs (English), KAS-ee-əs (English) | Ancient Roman, English | |
| Catina | | - | Romanian | |