| Clay | - | Teutonic Name | Clayborne | - | Teutonic Name |
| Clayburn | - | Teutonic Name | Clayden | - | English Name |
| Clayland | - | Teutonic Name | Clayton | - | Teutonic Name |
| Clayton | - | English Name | Clayton | - | United States Name |
| Clea | - | Maori Name | Cleary | - | Teutonic Name |
| Cleavon | - | African Name | Cledwyn | - | Teutonic Name |
| Cleit | - | Scottish Name | Clelia | - | Latin Name |
| Clemence | - | French Name | Clémence | - | Cameroon Name |
| Clemencia | - | Assyrian Name | Clément | - | Cameroon Name |
| Clement | - | Cyprien Name | Clement | - | Latin Name |
| Clement | - | Biblical Name | Clemente | - | Portuguese Name |
| Clementina | - | Portuguese Name | Clementine | - | West Indies Name |
| Clementius | - | Dutch Name | Clemira | - | Assyrian Name |
| Clemis | - | Assyrian Name | Clennan | - | Scottish Name |
| Cleo | - | American Name | Cleon | - | Teutonic Name |
| Cleopatra | - | African Name | Cleophas | - | Biblical Name |
| Clerc | - | Teutonic Name | Cletus | - | Teutonic Name |
| Cleve | - | Teutonic Name | Cleveland | - | Teutonic Name |
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