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All around the world, Ōka (Ока , Ōka) is a very rare mostly boy's, but infrequently female given name. The given name Ōka is habitual in Kazakhstan, where it is a rare gender-neutral name, and Russia, where it is a very rare boy's name. Likewise, Ōka is the last name as well as the forename.
Ōka is also a name for the fictitious and mythical characters: Ōka Kashima , the fictional character from Is It Wrong to Try to Pick Up Girls in a Dungeon?.