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Last name Gwak (Gwak , 곽 , غواك) , in all the world, is a common family name. The last name Gwak is characteristic of South Korea, where it is quite a common surname, Australia, where it is a very rare surname, and Canada. In absolute terms, it is commonest in South Korea, the United States, and Canada. Very seldom, Gwak is the forename as well as the last name.