| Conroy | - | Gaelic Name | Constant | - | French Name |
| Constant | - | Cameroon Name | Constantin | - | Italian Name |
| Constantine | - | Latin Name | Constantine | - | Assyrian Name |
| Constantinos | - | English Name | Conway | - | Gaelic Name |
| Conyers | - | American Name | Coogan | - | Teutonic Name |
| Cook | - | Teutonic Name | Coop | - | Teutonic Name |
| Cooper | - | Maori Name | Coorain | - | Aborigin Name |
| Coos | - | Biblical Name | Copeland | - | English Name |
| Copeland | - | Teutonic Name | Corban | - | English Name |
| Corben | - | English Name | Corbenic | - | Arthurian Name |
| Corbett | - | Teutonic Name | Corbin | - | Latin Name |
| Corbin | - | United States Name | Corby | - | Teutonic Name |
| Corbyn | - | English Name | Corcoran | - | Gaelic Name |
| Cord | - | German Name | Cordell | - | Teutonic Name |
| Cordero | - | Spanish Name | Corentin | - | Cyprien Name |
| Corentine | - | Aborigin Name | Corey | - | Anglo Name |
| Cori | - | Teutonic Name | Corin | - | Latin Name |
| Corin | - | Teutonic Name | Corliss | - | Teutonic Name |
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