| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 641 | Damon | Irish | Tame. | M | |
| 642 | Dana | Irish | A Dane. | F | |
| 643 | Daniel | Irish | Attractive. A translation of the Gaelic name Domhnall. | M | |
| 644 | Darby | Irish | Free from envy. A derivitive of Diarmait. Darby and Joan were a devoted elderly married couple originally depicted in a poem or ballad of the 18th century. | M | |
| 645 | Darce | Irish | Diminutive of Darcy: Dark one. | M | |
| 646 | Darcel | Irish | Dark. | F | |
| 647 | Darcell | Irish | Dark. | F | |
| 648 | Darcelle | Irish | Dark. | F | |
| 649 | Darcey | Irish | Dark. | F | |
| 650 | Darcey | Irish | Variant of Darcy: Dark one. | M | |
| 651 | Darchelle | Irish | Dark. | F | |
| 652 | Darci | Irish | Dark. | F | |
| 653 | Darcia | Irish | Dark. | F | |
| 654 | Darcie | Irish | Dark. | F | |
| 655 | Darcy | Irish | Dark. | F | |
| 656 | Darcy | Irish | Dark one. | M | |
| 657 | Darerca | Irish | Name of a saint. | F | |
| 658 | Daric | Irish | Strong; oak-hearted. See also Derek. | M | |
| 659 | Darick | Irish | Strong; oak-hearted. See also Derek. | M | |
| 660 | Darragh | Irish | Black oak; wealthy. | M | |