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Last name Guelin (Guelin ) , all around the world, is a rare surname. The cognomen Guelin is habitual in France, where it is a rare surname, Honduras, where it is a very rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in France, Germany, and the United States. Likewise, Guelin is the forename as well as the last name.