McKinley (surname) McKinley (surname) McKinley is a Scottish and Irish surname historically associated with northwestern Ireland's County Donegal, and the over-kingdom of Ulaid in northeastern Ireland and the Scottish Highlands. The McKinley are of the ancient Ulaid race and are a branch of its "Red Branch" MacDunleavy (dynasty) royal house of the Dal Fiatach which dominated the kingship of the over-kingdom of Ulaid (original Gaelic language Mac Duinnshléibhe). Etymology for the origins of the surname proposes that the Anglicized surname McKinley, like the surname MacNulty (Gaelic Mac an Ultaigh, trans. "son of the ultonian, ulidian or ulsterman"), arose originally from a Gaelic
Poland (surname) the examples where the 'Mac' or 'Mc' has been dropped can be explained for several reasons. In English controlled areas of Ireland (especially around The Pale), it was declared that the Irish take on names in an English form and many were required to do so in order to do business with the powers that be, or to obtain a tenancy on English controlled land. Census takers were also allowed to use either form, with or without the Gaelic prefix. It also was not uncommon for the 'Mac' or 'Mc' prefix to simply be incorporated into the surname to result