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Cognomen Bertran (Bertran , ベルトラン , Бертран ) , all over the world, is quite a common last name. The surname Bertran is habitual in Andorra, where it is quite a common surname, Spain, where it is quite a rare surname, and Puerto Rico. Not in comparison with a country's population, this name is the most popular in Spain, Argentina, and France. Likewise, Bertran is the forename as well as the last name.