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Surname Siou (Siou , ซิ่ว) , throughout the world, is quite a rare last name. The cognomen Siou is characteristic of Papua New Guinea, where it is quite a rare surname, France, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it is commonest in France, Papua New Guinea, and Algeria. Very seldom, Siou is the forename as well as the last name.