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Family name Poncin (Poncin ) , around the world, is quite a rare cognomen. The last name Poncin is habitual in Western Europe, particularly Belgium, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and France. Not in comparison with a country's population, the name is most common in France, Belgium, and the United States. Much less frequently, Poncin is the forename as well as the last name.