McNally is an Irish surname originating in County Tyrone, in the province of Ulster. It is the Anglicized form of Mac Conallaidh 'son of Cú Allaidh', a Gaelic name of the Cenél nEógain clan meaning the 'wild hound', i.e. 'wolf'.[1][2][3][4]
Prevalent in Ulster counties Antrim, Armagh and Monaghan, this McNally family is a branch of the “Northern Ó Néill” group of Ulster clans. They are separate from the Mayo name Mac an Fhailghigh.[5][6][7]