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Surname Mikio (Mikio , ミキオ , Микио ) , worldwide, is a common cognomen. The family name Mikio is habitual in Japan, where it is quite a common surname, Taiwan, where it is a rare surname, and the Democratic Republic of the Congo. Measured by absolute frequency, it is commonest in Japan, China, and the Democratic Republic of the Congo. Very seldom, Mikio is the forename as well as the last name.