Irish surname evidence

Regan surname origin and Irish county evidence

The strongest processed county signals for Regan include Wexford, Galway, Cork. These are evidence clusters rather than proof that every Regan family began in one place.

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Name history

What the historical record says

Regan anglicises the Gaelic Ó Riagáin, "descendant of Riagán," a name sometimes read as "little king." Several distinct septs bore it. The most notable were the Ó Riagáin of County Meath, reckoned among the tribes of the Tara region, and a Munster sept seated in north Tipperary. Driven from their eastern homeland, many of the name settled in Limerick and Cork. Regan, with the variant O'Regan, remains most numerous across the Munster counties.

Recorded Gaelic root: Ó Riagáin

County evidence

Strongest county signals

  1. Wexfordprocessed surname/place signal
  2. Galwayprocessed surname/place signal
  3. Corkprocessed surname/place signal
  4. Limerickprocessed surname/place signal
  5. Downprocessed surname/place signal
Read this carefully

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.