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Last name Mushan (Mushan , 木山 , 木杉 ) , across the world, is quite a rare surname. The last name Mushan is characteristic of Bahrain, where it is a rare surname, Australia, and India, where it is a very rare surname. Measured by absolute frequency, it is commonest in India, China, and Pakistan. More prevalently, Mushan is the forename as well as the last name.