| Claudia | - | Swiss Name | Cláudia | - | Portuguese Name |
| Claudia | - | Maori Name | Claudina | - | Italian Name |
| Claudine | - | Cyprien Name | Clea | - | Maori Name |
| Cleavon | - | African Name | Clelia | - | Latin Name |
| Clemence | - | French Name | Clémence | - | Cameroon Name |
| Clemencia | - | Assyrian Name | Clementina | - | Spanish Name |
| Clementine | - | Latin Name | Clemira | - | Assyrian Name |
| Cleo | - | American Name | Cleopatra | - | Egyptian Name |
| Cliff | - | English Name | Clio | - | Australian Name |
| Cloe | - | American Name | Cloee | - | American Name |
| Cloey | - | Greek Name | Cloie | - | Greek Name |
| Clover | - | Anglo Name | Cnidus | - | Biblical Name |
| Coaxoch | - | Nahuatl Name | Cocheta | - | American Name |
| Coco | - | French Name | Codee | - | Irish Name |
| Codi | - | Irish Name | Codi | - | American Name |
| Codie | - | Australian Name | Cohen | - | Hebrew Name |
| Cohen | - | Australian Name | Coira | - | Scottish Name |
| Colbi | - | English Name | Coleen | - | Gaelic Name |
| Colette | - | French Name |
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