What the historical record says
Foley anglicises the Gaelic Ó Foghladha, a name derived from foghail, "plunder," and so read as "descendant of the plunderer." The sept originated in County Waterford in the south-east of Munster and spread westward into the neighbouring counties of Cork and Kerry. Foley has remained a firmly Munster surname, concentrated across the south-western counties, with the Ó prefix dropped in the anglicised form now universally spelt Foley.
Recorded Gaelic root: Ó Foghladha
Strongest county signals
- Armaghprocessed surname/place signal
What this evidence can—and cannot—prove
Census clustering can show where a surname appeared strongly at a historical point in time. It cannot identify your exact ancestor, prove a clan relationship, or assign a coat of arms. Use it as a source-backed starting point alongside family records and parish research.