Montgomery
Montgomery—In the districts about Armagh and in the Lower Fews districts of that County, and in the Eastern parts of Co. Down, the names M'Glammery and Maglamery have been changed to Montgomery. M'Gomery (Mag Iomaire), a Galloway sept name has also been changed to Montgomery in many cases. See Bigger. Mag Ghiolla-Ambrois is the correct Gaelic form of M'Glammery.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees