| Name | Meaning | Gender | Origin |
|---|
| Clamedeus | Name Of A King | Male | Arthurian |
| Claudius | Lame. | Male | English |
| Claus | People's Victory | Male | Greek |
| Clementius | Merciful | Male | Dutch |
| Cletus | Summoned | Male | Greek |
| Clust | Mythical Son Of Clustfeinad | Male | Celtic |
| Clustfeinad | Mythical Father Of Clust | Male | Celtic |
| Cocidius | Mythical Hunter God | Male | Celtic |
| Cocytus | Myth Name (River Of Lamenting) | Male | Greek |
| Coeus | Myth Name (Father Of Leto) | Male | Greek |
| Corineus | Myth Name | Male | Greek |
| Cornelius | Strong Willed Or Wise | Male | Irish |
| Cottus | Myth Name (A Titan) | Male | Greek |
| Creusa | Myth Name (Daughter Of Erechteus) | Female | Greek |
| Cronus | Myth Name (A Titan) | Male | Greek |
| Ctesippus | Myth Name (One Of Penelope's Suitors) | Male | Greek |
| Cus | Name Of A King | Male | Arthurian |
| Custennin | Meaning Unknown | Male | Arthurian |
| Cycnus | Swan | Male | Greek |
| Cyrus | Sun | Male | Greek |
| Dabbous | Pin | Male | Arabic |
| Daedalus | Myth Name (Killed His Nephew) | Male | Greek |
| Danaus | Myth Name (Father Of The Danaides) | Male | Greek |
| Dardanus | Myth Name (Founder Of Troy) | Male | Greek |
| Darius | Name Of A Pharaoh | Male | Egyptian |
| Darrius | He Who Upholds The Good. | Male | Greek |
| Dassous | Spy | Male | Arabic |
| Deiphobus | Myth Name (A Son Of Priam) | Male | Greek |
| Delphinus | Myth Name (A Scout Of Poseidon) | Male | Greek |
| Demarcus | | Male | English |