Padraig Mac Giolla-Domhnaigh

Holly—This name in South-Eastern Ulster is the anglicised form of McQuillan, the County Louth sept, from Cuileann, holly, and I believe Hollywood comes from the same name, though said to come from O'Cuileanain. Hollywood is found in Armagh.

Alphabetical Index of Anglicised Surnames in Ireland

See also Woulfe’s Irish Names and Surnames
and O'Hart's Irish Pedigrees