| NAME | ORIGIN | MEANING | B/G |
| Adalardo | Celtic | noble | Boy |
| Aengus | Celtic | Exceptionally strong. | Boy |
| Africa | Celtic | pleasing, pleasant | Girl |
| Ahearn | Celtic | lord of the horses | Boy |
| Ahern | Celtic | Lord of the horses. | Boy |
| Aideen | Celtic/Gaelic | Flame | Girl |
| Aiden | Celtic/Gaelic | Fiery | Boy |
| Aife | Celtic | A great warrior woman of myth. | Girl |
| Aigneis | Celtic | Pure. | Girl |
| Aileen | Greek, Celtic | light, green meadow | Girl |
| Ailidh | Celtic | Kind. | Girl |
| Ailill | Celtic | Mythical king of Connaught. | Boy |
| Ailis | Celtic/Gaelic | Noble, Kind | Girl |
| Aine | Celtic | joy | Girl |
| Aingeal | Celtic | Angel. | Girl |
| Airell | Celtic/Gaelic | Nobelman | Girl |
| Airic | Celtic | Agreeable. | Girl |
| Aislin | Celtic/Gaelic | Dream | Girl |
| Aisling | Celtic/Gaelic | Vision, Dream | Girl |
| Aislinn | Celtic | a dream, vision, inspiration | Girl |
| Aithne | Celtic | little fire | Girl |
| Alan | Gaelic, Celtic | handsome, cheerful, noble | Boy |
| Alane | Celtic | Fair. | Girl |
| Alanson | Celtic | Son of Allan. | Boy |
| Alastrina | Celtic | Defends mankind. | Girl |
| Alastrine | Celtic | Defends mankind. | Girl |
| Alastriona | Celtic | Defends mankind. | Girl |
| Aleen | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | Girl |
| Aleena | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | Girl |
| Alene | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | Girl |