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Cognomen Guillard (جيار , Guillard ) , across the world, is a common last name. The cognomen Guillard is habitual in France, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Mauritius. Measured by absolute frequency, it is the most numerous in France, the United States, and Egypt. Much less frequently, Guillard is the forename as well as the last name.