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Cognomen Guelat (Guelat , Guélat ) , in the world, is a rare last name. The surname Guelat is characteristic of Western Europe, particularly Liechtenstein, where it is quite a rare surname, Switzerland, and France, where it is a very rare surname. Measured by absolute frequency, it is commonest in Switzerland, France, and the United States. Very seldom, Guelat is the forename as well as the last name.