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The name O'Brien in Ireland is among the ten most frequently found in the country. The name derives from the tenth century King of Ireland, Brian Boru and there were a number of Septs, the largest of which were based in Counties Clare, Limerick, Tipperary and Waterford. It is in these Counties that the majority of descendants can still be found.
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O'Brien coat of arms, family crest and O'Brien family history