| Cormac | - | Gaelic Name | Cornel | - | Swiss Name |
| Cornelio | - | Assyrian Name | Cornelius | - | Latin Name |
| Cornelius | - | Biblical Name | Cornell | - | West Indies Name |
| Corney | - | Teutonic Name | Corny | - | Teutonic Name |
| Corrado | - | Italian Name | Corrin | - | Latin Name |
| Cortez | - | Spanish Name | Corvin | - | Assyrian Name |
| Corwin | - | Gaelic Name | Corwin | - | Teutonic Name |
| Cory | - | Scottish Name | Cosmas | - | Assyrian Name |
| Cosmo | - | Greek Name | Cosmo | - | Italian Name |
| Cosmo | - | Teutonic Name | Costa | - | Teutonic Name |
| Costin | - | Romanian Name | Cotton | - | Teutonic Name |
| Coty | - | French Name | Court | - | Teutonic Name |
| Courtenay | - | Teutonic Name | Courtland | - | Anglo Name |
| Courtnay | - | Anglo Name | Courtney | - | English Name |
| Cove | - | English Name | Coven | - | Irish Name |
| Coveney | - | Teutonic Name | Cowan | - | Gaelic Name |
| Cowin | - | Latin Name | Coy | - | English Name |
| Coyle | - | Gaelic Name | Coyotl | - | Nahuatl Name |
| Coz | - | Biblical Name | Cozmo | - | Teutonic Name |
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