Holleron households mapped in 1901

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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.

DEDs where Holleron and a second surname are found together

This list shows total 1901 Holleron households by county.
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Holleron heads of household in the 1901 census