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Cognomen Rousseau (Rousseau , Руссо , רוסו , along with others...) , throughout the world, is a common last name. The cognomen Rousseau is habitual in France, where it is quite a common surname, Seychelles, and Monaco (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in France, Canada, and the United States. Much less frequently, Rousseau is the forename as well as the last name.