| Name | Meaning | Origin |
|---|
| Adair | From the ford by the oak trees. | Celtic Baby Names, English Baby Names, Gaelic Baby Names, Scottish Baby Names |
| Aengus | Exceptionally strong. | Celtic Baby Names, Irish Baby Names, Scottish Baby Names |
| Afric | Agreeable. | Celtic Baby Names, Irish Baby Names |
| Africa | Agreeable. | Celtic Baby Names, Gaelic Baby Names, Irish Baby Names |
| Ahearn | Lord of the horses. | Celtic Baby Names, Irish Baby Names |
| Ahern | Lord of the horses. | Celtic Baby Names, Gaelic Baby Names, Irish Baby Names |
| Aidan | Fire. | Anglo-Saxon Baby Names, Celtic Baby Names, Gaelic Baby Names, Irish Baby Names, American Baby Names |
| Aiden | Fire. | Celtic Baby Names, Gaelic Baby Names, Irish Baby Names, American Baby Names |
| Aife | A great warrior woman of myth. | Celtic Baby Names |
| Aigneis | Pure. | Celtic Baby Names, Gaelic Baby Names, Greek Baby Names, Irish Baby Names |
| Ailidh | Kind. | Celtic Baby Names |
| Ailill | Mythical king of Connaught. | Celtic Baby Names, Irish Baby Names |
| Ailis | noble. | Celtic Baby Names, English Baby Names, Gaelic Baby Names, German Baby Names, Irish Baby Names |
| Aina | Joy. | Celtic Baby Names, Swedish Baby Names |
| Aine | Fire or joy. | Celtic Baby Names, Irish Baby Names |
| Aingeal | Angel. | Celtic Baby Names, Irish Baby Names |
| Airell | Nobleman. | Celtic Baby Names |
| Airic | Agreeable. | Celtic Baby Names |
| Aithne | Fire. | Celtic Baby Names |
| Al | Harmony, stone, or noble. Also fair, handsome. Originally a saint's name, it was reintroduced to Britain during the Norman Conquest, remained popular throughout the Middle Ages, and was revived in the 19th century. | Celtic Baby Names, English Baby Names, Gaelic Baby Names, German Baby Names, American Baby Names |