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In all the world, Kazuo (Kazuo , カズオ , Казуо , along with others...) is quite a rare epicene given name. The first name Kazuo is characteristic of Japan, where it is quite a rare epicene name, the United States, where it is a rare male name, and Sweden. In absolute terms, it is commonest in Japan, the United States, and China. More prevalently, Kazuo is the last name as well as the forename.
Kazuo is also a name for the fictitious and mythical characters: Kazuo Saki , the fictional Teenage Mutant Ninja Turtles character, My Brother, the Bad Guy; Kazuo Kiriyama , the Battle Royale character; Kazuo Uzuki and Kazuo Tachibana , the fictional human from Captain Tsubasa.