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Surname Etymology and Meaning of MCCOSH

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Name meanings and etymologies are often disputed. The information here is compiled from freely available sources, and no claims whatsoever are made for accuracy, either historical or etymological.

Scottish and northern Irish: Anglicized form of Gaelic Mac Coise ‘son of Cos’, a byname meaning ‘messenger’ or ‘foot soldier’ (from cos ‘foot’, ‘leg’).

Source: Dictionary of American Family Names (2003)