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Cognomen Bosker (Bosker ) , worldwide, is a rare surname. The family name Bosker is characteristic of Netherlands, where it is quite a rare surname, Australia, where it is a rare surname, and Germany, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Netherlands, the United States, and Germany. Very seldom, Bosker is the forename as well as the last name.