| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 261 | Desmon | Gaelic | Man from south Munster. | M | |
| 262 | Desmond | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 263 | Desmund | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 264 | Devan | Gaelic | Servant. | M | |
| 265 | Devin | Gaelic | Servant. | M | |
| 266 | DevIyn | Gaelic | Fierce. | M | |
| 267 | Devlin | Gaelic | Fierce. | M | |
| 268 | Devyn | Gaelic | Servant. | M | |
| 269 | Dezmond | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 270 | Diarmad | Gaelic | Free man. | M | |
| 271 | Diarmaid | Gaelic | Free man. | M | |
| 272 | Diarmid | Gaelic | Free man. | M | |
| 273 | Dillon | Gaelic | Faithful. | M | |
| 274 | Diolmhain | Gaelic | Faithful. | M | |
| 275 | Diomasach | Gaelic | Proud. | M | |
| 276 | Dobhailen | Gaelic | Fierce. | M | |
| 277 | Domhnull | Gaelic | Dark stranger. | M | |
| 278 | Donahue | Gaelic | Dark warrior. | M | |
| 279 | Donald | Gaelic | Dark stranger. | M | |
| 280 | Donnchadh | Gaelic | Dark warrior. | M | |