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Last name Sioui (Сюй , Sioui , Сюи ) , all over the world, is quite a rare cognomen. The cognomen Sioui is characteristic of Azerbaijan, where it is quite a rare surname, Canada, where it is a rare surname, and Armenia. In absolute terms, it is the most numerous in Russia, Canada, and Ukraine. Much less frequently, Sioui is the forename as well as the last name.