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Cognomen Guyard (Guyard
, جويار
) , in all the world, is quite a common surname. The cognomen Guyard is habitual in France, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and Belgium. Measured by absolute frequency, the name is most common in France, the Democratic Republic of the Congo, and Iran. Much less frequently, Guyard is the forename as well as the last name.