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Cognomen イサオ (Isao , イサオ ) , in the entire world, is a common family name. The last name イサオ is habitual in Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Israel, where it is a rare surname. In absolute terms, it most frequently occurs in Japan, China, and Philippines. Very seldom, イサオ is the forename as well as the last name.