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Cognomen Guier (Guider , Guiar , Guier ) , around the globe, is quite a rare family name. The last name Guier is habitual in Tunisia, where it is quite a rare surname, Cameroon, and Costa Rica. Not in comparison with a country's population, it is the most numerous in the United States, Cameroon, and Tunisia. Much less frequently, Guier is the forename as well as the last name.