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Last name Mahon (Mahon , 马洪 , Махон ) , globally, is a common family name. The last name Mahon is characteristic of Ireland, where it is a common surname, Grenada, where it is quite a common surname, and Barbados. In absolute terms, the name is most common in the United States, Ireland, and the United Kingdom. Very seldom, Mahon is the forename as well as the last name.