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Family name Fontan (Fontan , 方坦 , Fontán ) , globally, is quite a common surname. The cognomen Fontan is habitual in Latin America and the Caribbean, particularly Puerto Rico, where it is quite a rare surname, Argentina, and Uruguay. Not in comparison with a country's population, it is the most numerous in Argentina, France, and Spain. Much less frequently, Fontan is the forename as well as the last name.