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Around the globe, Usan (Usan , Усан , อุสัน ) is quite a rare mostly boy's, but uncommonly feminine forename. The forename Usan is characteristic of Japan, where it is quite a rare masculine name, Kyrgyzstan, and Kazakhstan, where it is a rare male name. Measured by absolute frequency, this name is the most popular in Japan, India, and Nigeria. Very seldom, Usan is the last name as well as the forename.