| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 281 | Dechtire | Celtic | Mythical nursemaid. | F | |
| 282 | Deheune | Celtic | Divine one. | F | |
| 283 | Deirdre | Celtic | Sorrowful. | F | |
| 284 | Delia | Celtic | Diminutive of Bedelia: A variant of Bridget, who was the mythic Celtic goddess of fire and poetry. | F | |
| 285 | Deoch | Celtic | Mythical princess of Munster. | F | |
| 286 | Dermot | Celtic | Free. | M | |
| 287 | Desmond | Celtic | From south Munster. | M | |
| 288 | Deva | Celtic | Divine one. | F | |
| 289 | Devin | Celtic | Poet. | M | |
| 290 | Devona | Celtic | Divine one. | F | |
| 291 | Devyn | Celtic | Poet. | M | |
| 292 | Dewain | Celtic | Song. | M | |
| 293 | Dillion | Celtic | Faithful. | M | |
| 294 | Dinsmore | Celtic | From the hill fort. | M | |
| 295 | Diva | Celtic | Divine one. | F | |
| 296 | Divone | Celtic | Divine one. | F | |
| 297 | Doirean | Celtic | Sullen. | F | |
| 298 | Domhnall | Celtic | Stranger. | M | |
| 299 | Don | Celtic | Dark stranger. | M | |
| 300 | Donaghy | Celtic | Strong fighter. | M | |