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Family name Regnault (Regnault , Reinalt , Реньо ) , all over the world, is quite a common cognomen. The last name Regnault is habitual in France, where it is quite a rare surname, Venezuela, and Switzerland, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in France, Venezuela, and the United States. Much less frequently, Regnault is the forename as well as the last name.