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Last name Sangjun (Sangjun ) , throughout the world, is quite a rare surname. The surname Sangjun is habitual in Thailand, where it is quite a rare surname, South Korea, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Thailand, South Korea, and China. Much less frequently, Sangjun is the forename as well as the last name.