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In the entire world, Oku (奥 , オク , Oku ) is a common gender-neutral first name. The first name Oku is habitual in Nigeria, where it is quite a rare epicene name, China, where it is a rare unisex name, and Kazakhstan, where it is a rare predominantly girly, but scarcely boy's name. Measured by absolute frequency, this name is the most popular in China, Nigeria, and Ethiopia. Also, Oku is the last name as well as the forename.