| # | Nombre | Orígen | Significado | Género | |
|---|---|---|---|---|---|
| 1 | Abban | Irlandes | Abad. | M | |
| 2 | Abiageal | Irlandes | Irish form of Abigail. Que trae alegra. | F | |
| 3 | Abracham | Irlandes | Irish form of Abraham. | M | |
| 4 | Achaius | Irlandes | Horseman. | M | |
| 5 | Adamnan | Irlandes | Little Adam. | M | |
| 6 | Adan | Irlandes | Little fire. | F | |
| 7 | Adara | Irlandes | From the ford at the oak tree. | F | |
| 8 | Adare | Irlandes | From the ford del oak tree. | M | |
| 9 | Addergoole | Irlandes | From between two fords. | M | |
| 10 | Adeen | Irlandes | Little fire. | F | |
| 11 | Aderrig | Irlandes | From the red ford. | M | |
| 12 | Adhamh | Irlandes | del earth. | M | |
| 13 | Adhamhnan | Irlandes | Variante de Adamnan: Little Adam. | M | |
| 14 | Aeary | Irlandes | Scholar. | M | |
| 15 | Aedus | Irlandes | Fire. | M | |
| 16 | Aeneas | Irlandes | Praise. | M | |
| 17 | Aengus | Irlandes | One vigor. | M | |
| 18 | Afric | Irlandes | Pleasant. | F | |
| 19 | Africa | Irlandes | Pleasant. | F | |
| 20 | Agata | Irlandes | Amable. | F | |