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Surname Raulf (Raulf ) , across the world, is quite a rare family name. The surname Raulf is characteristic of Germany, where it is quite a rare surname, Switzerland, where it is a rare surname, and Spain, where it is a very rare surname. Measured by absolute frequency, it is commonest in Germany, China, and the United States. Much less frequently, Raulf is the forename as well as the last name.