Irish surname evidence

Maguire surname origin and Irish county evidence

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

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Name history

What the historical record says

Maguire derives from the Gaelic Mag Uidhir, "son of Odhar," the personal name Odhar meaning dun-coloured, sallow or pale. It was anglicised variously as Maguire, MacGuire and McGuire. The sept rose to prominence in County Fermanagh, where the Maguires became chiefs or lords from the late thirteenth century, ruling from Enniskillen until the Plantation of Ulster under James I. First noted in the annals around 956, they ranked among Ulster's most powerful families. The name remains overwhelmingly the most common in Fermanagh, with strong presence in neighbouring Cavan and Monaghan.

Recorded Gaelic root: Mag Uidhir

County evidence

Strongest county signals

  1. Corkprocessed surname/place signal
  2. Dublinprocessed surname/place signal
  3. Leitrimprocessed surname/place signal
  4. Tyroneprocessed 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.