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Cognomen イッセイ (Issei , イッセイ ) , in the entire world, is a common surname. The cognomen イッセイ is characteristic of Japan, where it is quite a rare surname, Indonesia, where it is a very rare surname, and Myanmar. In absolute terms, it is the most numerous in Japan, Indonesia, and China. Very seldom, イッセイ is the forename as well as the last name.