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Family name Rousseaux (Rousseaux , ルソー) , around the world, is quite a common surname. The surname Rousseaux is habitual in Guadeloupe, where it is quite a common surname, Belgium, where it is quite a rare surname, and France. In absolute terms, it is commonest in France, Belgium, and Argentina. Much less frequently, Rousseaux is the forename as well as the last name.