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Cognomen Okubo (オオクボ , Okubo , Окубо ) , throughout the world, is quite a rare last name. The surname Okubo is habitual in Japan, where it is a rare surname, Kenya, and United Arab Emirates. Not in comparison with a country's population, it most frequently occurs in Brazil, Japan, and the United States. More prevalently, Okubo is the forename as well as the last name.