| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 461 | Devyn | Irish | Variant of Devin: Poet. | M | |
| 462 | Dewayne | Irish | Dark. | M | |
| 463 | Dezmond | Irish | Variant of Desmond: From South Munster. Famous Bearer: Archbishop Desmond Tutu (of South Africa). | M | |
| 464 | Diarmaid | Irish | Free. | M | |
| 465 | Diarmait | Irish | Free from envy. | M | |
| 466 | Diarmuid | Irish | Free from envy. | M | |
| 467 | Dilan | Irish | Like a lion. | M | |
| 468 | Dillan | Irish | Variant of Dillon: Loyal. | M | |
| 469 | Dillen | Irish | Like a lion. | M | |
| 470 | Dillon | Irish | Like a son. From an Irish surname derived from the Old German first name Dillo. Also used as a variant spelling of Dylan, meaning 'Like a lion.'. | M | |
| 471 | Dilon | Irish | Variant of Dillon: Loyal. | M | |
| 472 | Dilyn | Irish | Variant of Dillon: Loyal. | M | |
| 473 | Dinsmore | Irish | Hill fort. | M | |
| 474 | Doherty | Irish | Wicked. | M | |
| 475 | Dolan | Irish | Black-haired. | M | |
| 476 | Don | Irish | Diminutive of Donovan: Brown-haired chieftain. From an Irish surname meaning dark brown. | M | |
| 477 | Donagh | Irish | Brown warrior. | M | |
| 478 | Donaghy | Irish | Variant of Donagh: Brown warrior. | M | |
| 479 | Donahue | Irish | Surname. | M | |
| 480 | Donal | Irish | Great chief, world mighty. The Irish form of the English Donald. | M | |