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Last name Lassalle (Lassalle , Лассаль ) , all over the world, is a common surname. The cognomen Lassalle is habitual in France, where it is quite a common surname, Puerto Rico, where it is quite a rare surname, and Luxembourg. In absolute terms, the name is most common in France, Argentina, and the United States. Much less frequently, Lassalle is the forename as well as the last name.