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Last name Imsun (Imsun , อิ่มสุ่น) , around the world, is a very rare cognomen. The family name Imsun is habitual in Thailand, where it is an extremely rare surname, China, and the United States. In absolute terms, it is commonest in China, Thailand, and India. More prevalently, Imsun is the forename as well as the last name.