| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 321 | Doy | Celtic | Dark stranger. | M | |
| 322 | Doyle | Celtic | Dark stranger. | M | |
| 323 | Drem | Celtic | Mythical son of Dremidydd. | M | |
| 324 | Driscol | Celtic | Interpreter. | M | |
| 325 | Driscoll | Celtic | Interpreter. | M | |
| 326 | Driskell | Celtic | Interpreter. | M | |
| 327 | Druce | Celtic | Wise. | M | |
| 328 | Drudwyn | Celtic | Mythical Mabon's dog. | M | |
| 329 | Drummond | Celtic | Lives on the hill top. | M | |
| 330 | Duane | Celtic | Song. | M | |
| 331 | Dubv | Celtic | Dark faced. | M | |
| 332 | Duer | Celtic | Hero. | M | |
| 333 | Duff | Celtic | Dark-skinned. | M | |
| 334 | Duffey | Celtic | Variant of Duff: Dark-skinned. | M | |
| 335 | Duffy | Celtic | Variant of Duff: Dark-skinned. | M | |
| 336 | Dughall | Celtic | Dark stranger. | M | |
| 337 | Duncan | Celtic | Dark skinned fighter. | M | |
| 338 | Dunham | Celtic | Dark skinned fighter. | M | |
| 339 | Dunley | Celtic | From the hill meadow. | M | |
| 340 | Dwayne | Celtic | Song. | M | |