Beattie, Beattison
Beattie, Beattison—MAC A BHEADHTAIGH.—These two surnames are found in most parts of the old Scottish province of Galloway, a sept of the "Wild Gael" of that country. The name originates from biathach, a victualler, and the placename of Dalbeattie, perhaps, originates from the sept.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees