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Surname Usan (Usan , Усан , อุสัน ) , around the globe, is quite a rare last name. The cognomen Usan is habitual in Qatar, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Myanmar. Measured by absolute frequency, this name is the most popular in Indonesia, Nigeria, and Myanmar. More frequently, Usan is the forename as well as the last name.