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In the entire world, Kosei (Kosei , コウセイ , Косей ) is a rare epicene first name. The first name Kosei is habitual in Japan, where it is a rare gender-neutral name, Tanzania, where it is a rare male name, and the United States, where it is an extremely rare mostly masculine, but infrequently female name. Not in comparison with a country's population, the name is most common in Japan, Tanzania, and China. More frequently, Kosei is the last name as well as the forename.