| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 521 | Dubg | Irish | Black haired. | M | |
| 522 | Dubh | Irish | Black-haired. | M | |
| 523 | Dubhagain | Irish | Black. | M | |
| 524 | Dubhan | Irish | Black. | M | |
| 525 | Dubhglas | Irish | Black and gray. | M | |
| 526 | DubhgMl | Irish | Dark stranger. | M | |
| 527 | Duffy | Irish | Surname. | M | |
| 528 | Dugald | Irish | Variant of Dougal: From the Gaelic dubhgall, meaning dark stranger. Daugal was the nickname the Irish gave to the Vikings. | M | |
| 529 | Dugan | Irish | Swarthy. | M | |
| 530 | Duggan | Irish | Variant of Dugan: Swarthy. | M | |
| 531 | Dughlas | Irish | Variant of Dubhglas: Black and gray. | M | |
| 532 | Duke | Irish | Diminutive of Marmaduke: Servant of Madoc (fortunate). | M | |
| 533 | Duwayne | Irish | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | |
| 534 | Dwain | Irish | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | |
| 535 | Dwaine | Irish | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | |
| 536 | Dwane | Irish | Dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | |
| 537 | Dwayne | Irish | From an Irish surname meaning black or dark. Many Irish and Scottish names have the meaning 'dark' or 'black.'. | M | |
| 538 | Dwyer | Irish | Dark wisdom. | M | |
| 539 | Dyllan | Irish | Variant of Dillon: Loyal. | M | |
| 540 | Dyllon | Irish | Variant of Dillon: Loyal. | M | |