| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Caelestinus | - | Late Roman | ||
| Caelestis | - | Late Roman | ||
| Caelia | - | Ancient Roman | ||
| Caelina | - | Ancient Roman | ||
| Caelinus | - | Ancient Roman | ||
| Caelius | - | Ancient Roman | ||
| Caesar | SEE-zər (English) | Ancient Roman | ||
| Caesarius | - | Late Roman | ||
| Cai (2) | - | Welsh Mythology, Arthurian Romance | ||
| Caietanus | - | Late Roman | ||
| Caius | - | Ancient Roman | ||
| Calixtus | - | Late Roman | ||
| Callistus | kə-LIS-təs (English) | Late Roman | ||
| Callixtus | - | Late Roman | ||
| Calogerus | - | Late Roman |