Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Abercrombie (archived) |
| Abercromie (archived) |
| Achesan |
| Achesan |
| Acheson |
| Acheson |
| Achison |
| Achison |
| Adair |
| Adam Derry/New Zealand |
| Adam Co. Monaghan |
| Adams Derry/New Zealand |
| Adams Co. Monaghan |
| Adamson Derry/New Zealand |
| Adamson Co. Monaghan |
| Adare |
| Ahearene |
| Ahearn |
| Ahearne |
| Ahern |
| Aherne |
| Aicken (archived) |
| Aickin (archived) |
| Aickins (archived) |
| Aiken (archived) |
| Aikens (archived) |
| Aikin (archived) |
| Aingléis (archived) |
| Aitcheson |
| Aitcheson |
| Aitchison |
| Aitchison |
| Aitken (archived) |
| Aitkin (archived) |
| Akin (archived) |
| Albanach (archived) |
| Alderdice |
| Alderdyce |
| Allingham (archived) |
| Allister Co. Down |
| Alpin |
| Alpine |
| Alton Kerry / Dakota county, Minn |
| Altún Kerry / Dakota county, Minn |
| Andrew |
| Andrews |
| Ardiff |
| Atcheson |
| Atcheson |
| Auliffe |
| Auliffe |