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|Halloran||Quite numerous: Connacht and scattered. Ir. Ó h-Allmhúráin, allmhúrach, a stranger from overseas, a pirate! Originally two septs: Galway and Clare. For more correct distribution see the more numerous O'Halloran. IF & SGG.|
|Holleran||fairly rare: Galway-Mayo. A Connacht variant of Halloran & O'Halloran, q.v.|
|O'Halloran||Very numerous: all areas, especially Munster. Ir. Ó h-Allmhúráin, allmhúrach, foreign. There were septs in Clare and Galway. See also Halloran. IF.|
Parishes where Holleran and a second surname are both baptised.
This list shows total Holleran Roman Catholic baptisms by county and parish.
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