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Surname Castanon (Castañon , Castanon , Castañón ) , across the world, is a common cognomen. The family name Castanon is habitual in Latin America and the Caribbean, particularly Guatemala, where it is quite a common surname, Mexico, and Bolivia, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Mexico, Guatemala, and the United States. Very seldom, Castanon is the forename as well as the last name.