| NAME | ORIGIN | MEANING | B/G |
| Abboid | Gaelic | Abbey father. | Boy |
| Adair | Gaelic | noble, exalted, oak-tree ford | Boy |
| Adhamh | Gaelic | Gaelic form of Adam. | Boy |
| Aherin | Gaelic | Owns many horses. | Boy |
| Aherne | Gaelic | Owns many horses. | Boy |
| Aidan | Middle English, Gaelic | help, little fire | Boy |
| Aiden | Celtic/Gaelic | Fiery | Boy |
| Aindreas | Gaelic | Manly. | Boy |
| Airdsgainne | Gaelic | From the height of the cliff. | Boy |
| Airleas | Gaelic | Pledge. | Boy |
| Alai | Gaelic | Defender of man. | Boy |
| Alan | Gaelic, Celtic | handsome, cheerful, noble | Boy |
| Alasdair | Gaelic | A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | Boy |
| Alaster | Gaelic | Defender of man. | Boy |
| Alistair | Gaelic | A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | Boy |
| Alistaire | Gaelic | Variant of Alexander defender of mankind. | Boy |
| Alister | Gaelic | Variant of Alexander defender of mankind. | Boy |
| Allan | Celtic/Gaelic | Handsome | Boy |
| Allen | Celtic/Gaelic | Fair, handsome | Boy |
| Allister | Gaelic | Defender of man. | Boy |
| Alroy | Gaelic | Red haired. | Boy |
| Amergin | Celtic/Gaelic | Poet | Boy |
| Angus | Gaelic, Celtic | superb, unique | Boy |
| Aodhagan | Gaelic | Ardent. | Boy |
| Aodhhan | Gaelic | Ardent. | Boy |
| Arlen | Celtic/Gaelic | Pledge | Boy |
| Arregaithel | Gaelic | From the land of the Gaels. | Boy |
| Artan | Celtic/Gaelic | Little Bear | Boy |
| Athdar | Gaelic | From the oak tree ford. | Boy |
| Athdara | Gaelic | From the oak tree ford. | Boy |
