| Cassidy | - | Irish Name | Cathan | - | Irish Name |
| Cato | - | Latin Name | Cavan | - | Irish Name |
| Chad | - | African Name | Chaim | - | Hebrew Name |
| Chaney | - | French Name | Chase | - | French Name |
| Chet | - | Thai Name | Chiron | - | Greek Name |
| Cian | - | Irish Name | Ciaran | - | Irish Name |
| Ciro | - | Persian Name | Clay | - | English Name |
| Cleary | - | Irish Name | Cody | - | English Name |
| Cole | - | English Name | Conall | - | Celtic Name |
| Conan | - | Irish Name | Conn | - | Irish Name |
| Corey | - | Celtic Name | Crewe | - | English Name |
| Crispin | - | Latin Name | Cristian | - | Latin Name |
| Cristo | - | Greek Name | Cy | - | Cyprien Name |
| Cyrus | - | Persian Name | Dacey | - | Gaelic Name |
| Dai | - | Welsh Name | Daley | - | Irish Name |
| Damas | - | Greek Name | Damon | - | Greek Name |
| Dane | - | English Name | Dante | - | Italian Name |
| Darby | - | Irish Name | Darcy | - | French Name |
| Darien | - | Greek Name | Darius | - | Greek Name |
| Darnell | - | French Name | Delmar | - | Latin Name |
| Demas | - | Greek Name | Dev | - | Sanskrit Name |
| Diego | - | Spanish Name | Dimitri | - | Greek Name |
| Donato | - | Latin Name | Drew | - | English Name |
| Duarte | - | Portuguese Name |
|
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