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All over the world, Issei (Issei , 一世 , イッセイ ) is a rare boy's forename. The first name Issei is characteristic of Japan, where it is a rare male name, Indonesia, where it is a very rare male name, and Mexico, where it is an extremely rare male name. Measured by absolute frequency, the name is most common in Japan, Indonesia, and China. More frequently, Issei is the last name as well as the forename.