| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 241 | Darren | Gaelic | Great. | M | |
| 242 | Darrick | Gaelic | Strong; oak-hearted. See also Derek. | M | |
| 243 | Darrin | Gaelic | Variant of Darren: Great. | M | |
| 244 | Darroch | Gaelic | Strong; oak-hearted. See also Derek. | M | |
| 245 | Darrock | Gaelic | Strong; oak-hearted. See also Derek. | M | |
| 246 | Darron | Gaelic | Variant of Darren: Great. | M | |
| 247 | Darryn | Gaelic | Variant of Darren: Great. | M | |
| 248 | DAry | Gaelic | Dark. | M | |
| 249 | Daryn | Gaelic | Great. | M | |
| 250 | Dearan | Gaelic | Great. | M | |
| 251 | Deasach | Gaelic | Southerner. | M | |
| 252 | Deasmumhan | Gaelic | Man from south Munster. | M | |
| 253 | Deegan | Gaelic | Black-haired. | M | |
| 254 | Delano | Gaelic | Healthy black man. | M | |
| 255 | Dempsey | Gaelic | Proud. | M | |
| 256 | Deorsa | Gaelic | Farmer. | M | |
| 257 | Dermod | Gaelic | Free man. | M | |
| 258 | Dermot | Gaelic | Free man. | M | |
| 259 | Dermott | Gaelic | Free man. | M | |
| 260 | Derry | Gaelic | Red haired; Oak grove. Surname. | M | |