The most common meaning of Byrne (variations: Byrnes, O'Byrne) is a surname derived from the Irish name Ó Broin.
There are two Irish surnames which have Byrne as their English spelling; the most common comes from Ó Broin, which refers to the Leinster-based family of Bran as described below, while the less common family name is Ó Beirn or Ó Beirne in Irish. The latter is most commonly found in Mayo, Sligo and Donegal in the Northwest of Ireland.
By Dean Hanley
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