| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 421 | Darsey | Irish | Variant of Darcy: Dark one. | M | |
| 422 | Darsy | Irish | Variant of Darcy: Dark one. | M | |
| 423 | Dary | Irish | Wealthy. | M | |
| 424 | Davey | Irish | Variant of David 'beloved.'. | M | |
| 425 | Davie | Irish | Variant of David 'beloved.'. | M | |
| 426 | Dawayne | Irish | Dark. | M | |
| 427 | Deaclan | Irish | Variant of Declan: Famous bearer: 6th century Irish St. Declan. | M | |
| 428 | Deaglan | Irish | Name of a saint. | M | |
| 429 | Declan | Irish | Famous bearer: 6th century Irish St. Declan. | M | |
| 430 | Deegan | Irish | Black-haired. | M | |
| 431 | Delaine | Irish | From the elder tree grove. | M | |
| 432 | Delainey | Irish | Variant of Delaney: Competitor's child; from the river Slaney. | M | |
| 433 | Delainy | Irish | Variant of Delaney: Competitor's child; from the river Slaney. | M | |
| 434 | Delancy | Irish | From the elder tree grove. | M | |
| 435 | Delane | Irish | From the elder tree grove. | M | |
| 436 | Delaney | Irish | Competitor's child; from the river Slaney. | M | |
| 437 | Delano | Irish | From the elder tree grove. | M | |
| 438 | Delany | Irish | Variant of Delaney: Competitor's child; from the river Slaney. | M | |
| 439 | Dempsey | Irish | Proud. | M | |
| 440 | Deoradhain | Irish | Exile. | M | |