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Last name Úlfr (Ulf , Úlfr, Ulvila ) , in the world, is quite a rare surname. The cognomen Úlfr is habitual in Northern Europe, particularly Sweden, where it is quite a rare surname, Finland, and Denmark, where it is a rare surname. In absolute terms, it most frequently occurs in Sweden, Spain, and the United States. Predominantly, Úlfr is the forename as well as the last name.