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Surname Inhwan (Inhwan , 인환 , อินหวัน ) , all around the world, is a very rare last name. The family name Inhwan is habitual in Thailand, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and China. In absolute terms, this name is the most popular in China, Thailand, and the United States. Predominantly, Inhwan is the forename as well as the last name.