| Cashlin | - | Irish Name | Casluhim | - | Biblical Name |
| Cason | - | Scottish Name | Caspar | - | Persian Name |
| Casper | - | Persian Name | Caspian | - | English Name |
| Cassidy | - | Irish Name | Cassius | - | French Name |
| Caster | - | English Name | Castiel | - | Hebrew Name |
| Cat | - | Scottish Name | Catalin | - | Romanian Name |
| Cathair | - | Scottish Name | Cathan | - | Irish Name |
| Cathmor | - | Gaelic Name | Cato | - | Latin Name |
| Catterick | - | Arthurian Name | Cauley | - | Scottish Name |
| Caulton | - | English Name | Cavalon | - | Arthurian Name |
| Cavan | - | Gaelic Name | Caw | - | Arthurian Name |
| Cawley | - | Scottish Name | Cayden | - | Gaelic Name |
| Caydon | - | American Name | Cayle | - | English Name |
| Cayne | - | Hebrew Name | Cayson | - | American Name |
| Ceanfhionn | - | Gaelic Name | Ceard | - | Scottish Name |
| Ceardach | - | Scottish Name | Ceasar | - | English Name |
| Ceawlin | - | Anglo Name | Cecil | - | Latin Name |
| Cecilio | - | Italian Name | Cecilius | - | Dutch Name |
| Cedar | - | English Name | Cedd | - | Anglo Name |
| Cedric | - | English Name | Cedrick | - | Celtic Name |
| Cedrik | - | English Name | Cedron | - | Biblical Name |
| Cedrych | - | Welsh Name | Cem | - | Algerian Name |
| Cemal | - | Algerian Name | Cenwalh | - | Anglo Name |
| Ceolfrith | - | Anglo Name | Ceolwulf | - | Anglo Name |
| Cephas | - | Biblical Name |
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