| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Aislin | ASH-ling, ASH-lin | Irish | ||
| Aisling | ASH-ling | Irish | ||
| Aislinn | - | Irish | ||
| Aithne | - | Irish | ||
| Alannah | ə-LAN-ə (English) | English (Modern), Irish | ||
| Alaois | AL-eesh | Irish | ||
| Alastar | - | Irish | ||
| AlastrÍOna | al-as-TREE-na | Irish | ||
| Alby | - | Irish | ||
| Amhlaoibh | - | Irish | ||
| Angus | ANG-gəs | Scottish, Irish, English | ||
| AnraÍ | - | Irish | ||
| Aodh | EE, AY | Irish, Scottish, Irish Mythology | ||
| AodhÁN | - | Irish, Scottish, Irish Mythology | ||
| AodhagÁN | - | Irish, Scottish |