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Last name Окубо (Toshimichi , Okubo , Okoubo ) , worldwide, is quite a rare family name. The surname Окубо is characteristic of Japan, where it is quite a rare surname, Ivory Coast, where it is a rare surname, and Kenya. In absolute terms, it most frequently occurs in Japan, Brazil, and the United States. Likewise, Окубо is the forename as well as the last name.