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Cognomen Gillet (Gillet , 吉列 , ジレ) , in all the world, is a common surname. The cognomen Gillet is characteristic of Western Europe, particularly France, where it is quite a common surname, Belgium, and Luxembourg. Not in comparison with a country's population, it is the most numerous in France, Belgium, and the United States. Very seldom, Gillet is the forename as well as the last name.