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Cognomen Haga (ハガ , Haga , Хага ) , in the world, is a common surname. The cognomen Haga is habitual in Norway, where it is quite a common surname, Hungary, where it is quite a rare surname, and Finland. Measured by absolute frequency, it is the most numerous in Norway, the United States, and Egypt. Likewise, Haga is the forename as well as the last name.