| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 341 | Dermott | Gaelic | Free man. | M | |
| 342 | Derry | Gaelic | Red haired; Oak grove. Surname. | M | |
| 343 | Desmon | Gaelic | Man from south Munster. | M | |
| 344 | Desmond | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 345 | Desmund | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 346 | Devan | Gaelic | Servant. | M | |
| 347 | Devin | Gaelic | Servant. | M | |
| 348 | DevIyn | Gaelic | Fierce. | M | |
| 349 | Devlin | Gaelic | Fierce. | M | |
| 350 | Devyn | Gaelic | Servant. | M | |
| 351 | Dezmond | Gaelic | From South Munster. An Irish surname referring to Munster: (one of ancient Ireland's five regions.). | M | |
| 352 | Diarmad | Gaelic | Free man. | M | |
| 353 | Diarmaid | Gaelic | Free man. | M | |
| 354 | Diarmid | Gaelic | Free man. | M | |
| 355 | Dillon | Gaelic | Faithful. | M | |
| 356 | Diolmhain | Gaelic | Faithful. | M | |
| 357 | Diomasach | Gaelic | Proud. | M | |
| 358 | Diorbhall | Gaelic | Gaelic form of Dorothy. | F | |
| 359 | Dobhailen | Gaelic | Fierce. | M | |
| 360 | Doire | Gaelic | Ann. | F | |