Padraig Mac Giolla-Domhnaigh

Priestly—This name is the anglicised form of the Co. Galway sept name O'Sagartain, and the name is confused with Preston, the Cheshire and Lancashire name, and with Prestre, a French name.

Alphabetical Index of Anglicised Surnames in Ireland

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