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Cognomen Oby (Oby , Oaby ) , in the entire world, is quite a common surname. The cognomen Oby is habitual in Nigeria, where it is quite a rare surname, Cameroon, where it is a rare surname, and Indonesia. Measured by absolute frequency, this name is the most popular in Nigeria, Indonesia, and the United States. Likewise, Oby is the forename as well as the last name.