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Cognomen Oni (Oni , On , 鬼 ) , worldwide, is a widespread last name. The cognomen Oni is habitual in Brunei, where it is a common surname, Malaysia, where it is quite a common surname, and Nigeria (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Nigeria, China, and Japan. Also, Oni is the forename as well as the last name.