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Last name Arnould (Arnould , Арну , أرنولد) , across the world, is a common surname. The cognomen Arnould is habitual in Western Europe, particularly Belgium, where it is quite a common surname, France, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in France, Belgium, and the United States. Very seldom, Arnould is the forename as well as the last name.