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Last name Rieu (ريو
, Rieu
, 瑞欧
) , all over the world, is quite a common cognomen. The surname Rieu is habitual in France, where it is quite a rare surname, Sudan, and Libya, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in France, Sudan, and Iraq. Much less frequently, Rieu is the forename as well as the last name.