| Cromwell | - | Teutonic Name | Cronan | - | Gaelic Name |
| Crosby | - | Teutonic Name | Cross | - | Teutonic Name |
| Crudel | - | Arthurian Name | Cruim | - | Scottish Name |
| Cruz | - | Spanish Name | Cruze | - | Spanish Name |
| Cruzita | - | Maori Name | Crystal | - | United States Name |
| Csaba | - | Hungarian Name | Csilla | - | Hungarian Name |
| Cualli | - | Nahuatl Name | Cuauhtemoc | - | Nahuatl Name |
| Cuba | - | American Name | Cuetlachtli | - | Nahuatl Name |
| Cuetzpalli | - | Nahuatl Name | Cuicatl | - | Nahuatl Name |
| Cuinn | - | Gaelic Name | Cuixtli | - | Nahuatl Name |
| Culbert | - | Teutonic Name | Culhwch | - | Arthurian Name |
| Culiean | - | Gaelic Name | Cullan | - | Gaelic Name |
| Cullen | - | Irish Name | Culley | - | Gaelic Name |
| Culloden | - | Scottish Name | Cullodena | - | Scottish Name |
| Cullodina | - | Scottish Name | Culver | - | Teutonic Name |
| Culzean | - | Scottish Name | Cuma | - | Turkish Name |
| Cumafer | - | Turkish Name | Cumali | - | Turkish Name |
| Cumhur | - | Turkish Name | Cumin | - | Scottish Name |
| Cumina | - | Scottish Name | Cumming | - | Scottish Name |
| Cunaaluk | - | Eskimo Name | Cunaq | - | Eskimo Name |
| Cundry | - | Arthurian Name |
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