| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cadeyrn | - | Ancient Celtic | ||
| Caecilia | - | German, Ancient Roman | ||
| Caecilius | - | Ancient Roman | ||
| Caelia | - | Ancient Roman | ||
| Caelina | - | Ancient Roman | ||
| Caelinus | - | Ancient Roman | ||
| Caelius | - | Ancient Roman | ||
| Caesar | SEE-zər (English) | Ancient Roman | ||
| Caiside | - | Ancient Irish | ||
| Caius | - | Ancient Roman | ||
| Callias | - | Ancient Greek (Latinized) | ||
| Calvus | - | Ancient Roman | ||
| 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 | ||
| Caomh | - | Ancient Irish |