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Last name Olaniyan (Olaniyan ) , all over the world, is a common cognomen. The family name Olaniyan is habitual in Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and Ireland, where it is a rare surname. In absolute terms, it is the most numerous in Nigeria, Niger, and the United States. Also, Olaniyan is the forename as well as the last name.