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Last name Macc (Macc , Mcmahon ) , globally, is a common cognomen. The last name Macc is habitual in Ireland, where it is a common surname, Australia, where it is quite a common surname, and Isle of Man (explore the name in all countries). In absolute terms, it most frequently occurs in the United States, the United Kingdom, and Australia. Much less frequently, Macc is the forename as well as the last name.