Padraig Mac Giolla-Domhnaigh

Quay—This name is the anglicised form of MacKay in the Isle of Man. The name is more common than its other form Kay. It is written M'Quay in Ulster and in Galloway; in Gaelic Mac Aoidh. See Kay.

Alphabetical Index of Anglicised Surnames in Ireland

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