| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 21 | Aidan | Irish | Warm; little fire. A masculine variant of Eshne from Irish Gaelic. Famous Bearer: actor Aidan Quinn. | M | |
| 22 | Aiden | Irish | Fiery. | M | |
| 23 | Aidrian | Irish | From the Adriatic. | M | |
| 24 | Ailbhe | Irish | Bright. | M | |
| 25 | Ailfrid | Irish | Wise. | M | |
| 26 | Ailill | Irish | Sprite. | M | |
| 27 | Ailin | Irish | Handsome. | M | |
| 28 | Aindreas | Irish | Strong. | M | |
| 29 | Aineislis | Irish | Glorious stand. | M | |
| 30 | Ainmire | Irish | Great lord. | M | |
| 31 | Airleas | Irish | Pledge. | M | |
| 32 | Alahhaois | Irish | Famous soldier. | M | |
| 33 | Alhan | Irish | Pale. | M | |
| 34 | Alphonsus | Irish | Noble or ready. | M | |
| 35 | Alroy | Irish | Red haired. | M | |
| 36 | Alsandair | Irish | Defender of man. | M | |
| 37 | Amblaoibh | Irish | Relic. | M | |
| 38 | Ambros | Irish | Divine. | M | |
| 39 | Amery | Irish | Ridge; long hill. | M | |
| 40 | Amhlaoibh | Irish | Irish form of Olaf. | M | |