| Curran | A hero or one with a sharp spear. |
| CuUladh | Hound of Ulster |
| Cuyler | A person who is an archer. |
| Cynfor | A chief or great warrior. |
| Dacia | A name meaning from the Dacia land. |
| Daeg | A person of the daylight. |
| Daegan | A small and dark warrior. |
| Dagen | The day or the daylight. |
| Dahy | Quick and agile |
| Daibheid | A name meaning the beloved. |
| Daibhid | Variant of Daibhidh: Beloved. |
| Dailey | Variant of Daly: Gather together. |
| Daimhin | A name meaning little deer. |
| Daire | An Irish name meaning fruitful or oak. |
| Daith | Diminutive of Daibhidh: Beloved. |
| Daithi | Beloved or quick and agile |
| Daithm | Variant of Daibhidh: Beloved. |
| Dal | Variant of Dallin blind. |
| Dalan | Variant of Dallin blind. |
| Dallan | A name meaning blind or sightless. |
| Dallen | Variant of Dallin blind. |
| Dallon | Variant of Dallin blind. |
| Dalon | Variant of Dallin blind. |
| Daman | Controller; Demon; One who controls; Tame; Variant of Damon: Gentle. To tame. A variant of Damian. In Greek legend Damon was a loyal friend of Pythias. Famous bearer in modern times: American author Damon Runyon. |
| Damhnait | The name of a saint bard |
| Damon | To tame, subdue, or be constant. |
| Dana | A Dane; Danish, From Denmark; From Denmark; From Denmark. Also a variant of Daniel.; Feminine form of Daniel: God has judged, or God is judge. The Old Testament Daniel was a 6th century BC prophet who miraculously survived the den of lions.; Mother of God |
| Danelea | A gift of God from the heavens. |
| Daniel | Attractive. A translation of the Gaelic name Domhnall.; God is my judge; God is my Judge. The biblical prophet and writer of Book of Daniel was a teenager when taken to Babylon after the destruction of Jerusalem in 607 BC. He survived two death sentences: |
| Darby | Derived from the deer park. |
| Darcie | A name meaning dark or from Arcy |
| Darerca | Name of a saint |
| Daric | Strong: oak-hearted. See also Derek. |
| Darick | Strong: oak-hearted. See also Derek. |
| Darragh | An oak tree or oak wood. |
| Darrick | Strong: oak-hearted. See also Derek. |
| Darrie | A diminutive form meaning dear one. |
| Darroch | Strong: oak-hearted. See also Derek. |
| Darrock | Strong: oak-hearted. See also Derek. |
| Darry | A short form meaning dear one. |