| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Dagen | Gaelic | Black-haired. | M | |
| 302 | Daibhidh | Gaelic | Beloved. | M | |
| 303 | Daimhin | Gaelic | Servant. | M | |
| 304 | Dall | Gaelic | Wise. | M | |
| 305 | Dallas | Gaelic | Wise. | M | |
| 306 | Daly | Gaelic | Counselor. | M | |
| 307 | Dany | Gaelic | Dark. | M | |
| 308 | Dar | Gaelic | Dark. | M | |
| 309 | Dara | Gaelic | Oak tree. | F | |
| 310 | Daran | Gaelic | Variant of Darren: Great. | M | |
| 311 | Darby | Gaelic | Free man. | M | |
| 312 | Darce | Gaelic | Dark. | M | |
| 313 | Daren | Gaelic | Variant of Darren: Great. | M | |
| 314 | Daric | Gaelic | Strong; oak-hearted. See also Derek. | M | |
| 315 | Darick | Gaelic | Strong; oak-hearted. See also Derek. | M | |
| 316 | Darin | Gaelic | Variant of Darren: Great. | M | |
| 317 | Daron | Gaelic | Great. | M | |
| 318 | Darra | Gaelic | Oak tree. | F | |
| 319 | Darran | Gaelic | Variant of Darren: Great. | M | |
| 320 | Darren | Gaelic | Great. | M | |