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Family name Vilches (Vilches ) , globally, is a common cognomen. The last name Vilches is characteristic of Latin America and the Caribbean, particularly Chile, where it is quite a common surname, Argentina, and Uruguay, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Chile, Argentina, and Spain. Much less frequently, Vilches is the forename as well as the last name.