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Last name Loun (Loon , Loun , Loen ) , in the world, is a common surname. The cognomen Loun is habitual in Malaysia, where it is a common surname, Netherlands, where it is quite a common surname, and Aruba (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Malaysia, Netherlands, and Myanmar. Much less frequently, Loun is the forename as well as the last name.