Mac an Ghoill is a Gaelic surname originating in Ireland and Scotland. It is the original Gaelic form of the anglicized surname McGill, meaning "son of the foreigner" (mac "son of" + an ghoill, genitive of gall "foreigner, stranger"). The term gall was historically used by the Gaels to refer to Norse or Viking settlers, as well as later Norman invaders, indicating that early bearers of this name may have been of Norse-Gaelic or Hiberno-Norman descent.
Cultural and Historical Context
In medieval Ireland and Scotland, the Gaelic word gall specifically denoted Scandinavians, particularly the Vikings who established settlements along the coasts starting in the 8th century. Over time, the name Mac an Ghoill would have been used to identify a family's ancestral origin from such a "foreign" group, similar to other names like Gallagher (Gallach "foreigner-related"). The clan associated with the name was historically found in southwestern Scotland and Ulster, particularly in County Antrim.
Anglicization to McGill
The prefix Mac "son" followed by the definite article an was often merged or dropped in anglicized forms. Mac an Ghoill was simplified to forms like MacGill or McGill, with Gill representing a truncated version of Ghoill. This process mirrored that of other Irish/Scottish surnames such as Mac an tSagairt (anglicized as MacVicar or McVicar).
Demographics
According to Forebears, the surname Mac an Ghoill remains extremely rare in its original written form, and it does not appear in the top 100,000 surnames during any census; only a handful of individuals still bear this specific spelling, mostly in Ireland. The anglicized variants, particularly McGill, are far more numerous, ranking in the thousands globally—strongest in Scotland, Northern Ireland, and parts of Canada and the United States with Scottish/Northern Irish heritage.
- Meaning: "son of the foreigner"
- Origin: Irish, Scottish (Gaelic)
- Type: Patronymic/Byname
- Usage Regions: Ireland (especially Ulster), Scotland (especially Galloway)
Sources: Forebears — mac-an-ghoill