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Family name Oyo (Oyo ) , across the world, is a common last name. The last name Oyo is habitual in the Democratic Republic of the Congo, where it is quite a common surname, Uganda, where it is quite a rare surname, and Switzerland, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the Democratic Republic of the Congo, Nigeria, and Indonesia. Likewise, Oyo is the forename as well as the last name.