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Cognomen ミツオ (Mitsuo , ミツオ , Mituo ) , in all the world, is a common family name. The last name ミツオ is characteristic of Japan, where it is quite a common surname, Hong Kong, where it is a rare surname, and Malaysia. Measured by absolute frequency, it is commonest in Japan, China, and Brazil. Much less frequently, ミツオ is the forename as well as the last name.