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Family name 一男 (一男 , Kazuo , Komizu ) , around the world, is a common last name. The last name 一男 is habitual in Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and Malaysia. Not in comparison with a country's population, this name is the most popular in Japan, China, and Indonesia. Also, 一男 is the forename as well as the last name.