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Surname Haff (Haf , Hof , Haffi ) , throughout the world, is a common family name. The family name Haff is characteristic of Western Europe, particularly Netherlands, where it is quite a common surname, Germany, where it is quite a rare surname, and Luxembourg. Measured by absolute frequency, it most frequently occurs in Germany, Netherlands, and the United States. Very seldom, Haff is the forename as well as the last name.