| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 741 | 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 | |
| 742 | Dilon | Irish | Variant of Dillon: Loyal. | M | |
| 743 | Dilyn | Irish | Variant of Dillon: Loyal. | M | |
| 744 | Dinsmore | Irish | Hill fort. | M | |
| 745 | Doherty | Irish | Wicked. | M | |
| 746 | Doireann | Irish | Sullen. | F | |
| 747 | Dolan | Irish | Black-haired. | M | |
| 748 | Dominica | Irish | Name of a saint. | F | |
| 749 | Don | Irish | Diminutive of Donovan: Brown-haired chieftain. From an Irish surname meaning dark brown. | M | |
| 750 | Donagh | Irish | Brown warrior. | M | |
| 751 | Donaghy | Irish | Variant of Donagh: Brown warrior. | M | |
| 752 | Donahue | Irish | Surname. | M | |
| 753 | Donal | Irish | Great chief, world mighty. The Irish form of the English Donald. | M | |
| 754 | Donavan | Irish | Brown-haired chieftain. | M | |
| 755 | Donavon | Irish | Brown-haired chieftain. | M | |
| 756 | Donegan | Irish | Surname. | M | |
| 757 | Donell | Irish | Variant of Donald 'great chief.'. | M | |
| 758 | Donelle | Irish | Feminine form of Donal: rules the world. | F | |
| 759 | Donn | Irish | Brown. In mythology the Irish Donn was known as king of the underworld. | M | |
| 760 | Donnan | Irish | Brown. | M | |