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Cognomen Okuma (オオクマ , Okuma , 大熊 ) , in the entire world, is quite a rare surname. The surname Okuma is habitual in Taiwan, where it is a rare surname, Peru, and Slovakia. Not in comparison with a country's population, this name is the most popular in Nigeria, Brazil, and the United States. More frequently, Okuma is the forename as well as the last name.