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Surname Castanyer (Castanyer ) , globally, is a rare cognomen. The surname Castanyer is characteristic of Andorra, where it is quite a rare surname, Spain, where it is a rare surname, and Switzerland, where it is a very rare surname. Measured by absolute frequency, it is commonest in Spain, France, and Andorra. Likewise, Castanyer is the forename as well as the last name.