| Cillian | Battle | Male |
| Clancy | Ruddy Warrior | Male |
| Clodovea | Feminine Form Of Clodoveo Famous Warrior | Female |
| Clodoveo | Famous Warrior | Male |
| Clotilda | Heroine | Female |
| Clotilde | Heroine | Female |
| Clovis | Name Of A King | Male |
| Cochise | Renowned Warrior Chief Of The Chiricahua Apache. | Male |
| Conall | Myth Name (Ulster Chieftain) | Male |
| Conlaoch | Meaning Unknown | Male |
| Connla | Myth Name (Son Of Conn) | Male |
| Dal | Variant Of Dallin Blind. | Male |
| Dalena | Small Valley. Abbreviation Of Madeline. | Female |
| Denis | Named For Saint Denys | Male |
| Dermot | Free | Male |
| Dezba | Navajo Name Meaning "Goes To War." | Female |
| Dieter | Gifted Ruler. Variant Of Diederick. | Male |
| Dina | From The Valley | Female |
| Diomedes | Myth Name (An Evil King) | Male |
| Donaghy | Strong Fighter | Male |
| Donahue | Dark Warrior | Male |
| Donnachadh | Brown Warrior | Male |
| Donnchadh | Strong Fighter | Male |
| Donovan | Strong Fighter | Male |
| Dreng | Warrior | Male |