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Surname Харкин (Harkin , Харкин , Xarkin) , in the world, is quite a common last name. The cognomen Харкин is characteristic of Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. In absolute terms, this name is the most popular in the United Kingdom, Ireland, and the United States. Very seldom, Харкин is the forename as well as the last name.