| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 281 | Donny | Gaelic | Form of Donn. In mythology the Irish Donn was known as king of the underworld. | M | |
| 282 | Dooley | Gaelic | Dark hero. | M | |
| 283 | Doyle | Gaelic | Dark stranger. | M | |
| 284 | Dubhgall | Gaelic | Dark stranger. | M | |
| 285 | Dubhgan | Gaelic | Dark skinned. | M | |
| 286 | Dubhglas | Gaelic | Dark water. | M | |
| 287 | Dubhloach | Gaelic | Dark hero. | M | |
| 288 | Dubhthach | Gaelic | Dark skinned. | M | |
| 289 | Duff | Gaelic | Dark skinned. | M | |
| 290 | Duffy | Gaelic | Dark skinned. | M | |
| 291 | Dugald | Gaelic | Dark stranger. | M | |
| 292 | Dugan | Gaelic | Dark skinned. | M | |
| 293 | Dughall | Gaelic | Dark stranger. | M | |
| 294 | Duncan | Gaelic | Dark warrior 'Brown-haired.'. | M | |
| 295 | Eachann | Gaelic | Steadfast. | M | |
| 296 | Eachthighearn | Gaelic | Horse lord. | M | |
| 297 | Ealadhach | Gaelic | Genius. | M | |
| 298 | Ealuvig | Gaelic | Ruler of the home. | M | |
| 299 | Eaman | Gaelic | Earnest. | M | |
| 300 | Eamon | Gaelic | Rich protector. | M | |