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Family name Weisen (伟森 , 卫森 , 炜森 ) , across the world, is quite a rare last name. The surname Weisen is characteristic of Luxembourg, where it is quite a rare surname, Mauritius, and China, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in China, the United States, and Germany. More frequently, Weisen is the forename as well as the last name.