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Surname Riou (ريو , 里奥 , Riou ) , around the world, is a common family name. The cognomen Riou is habitual in France, where it is quite a common surname, Reunion, and Mauritius, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in France, Sudan, and Ivory Coast. Much less frequently, Riou is the forename as well as the last name.