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Cognomen Fog (Fog , 福格 , Фог ) , across the world, is quite a rare surname. The cognomen Fog is characteristic of Northern Europe, particularly Denmark, where it is quite a common surname, Norway, where it is a rare surname, and Sweden. In absolute terms, it most frequently occurs in Denmark, the United States, and Egypt. Very seldom, Fog is the forename as well as the last name.