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Surname Anco (Anco , Ancui ) , globally, is quite a common cognomen. The cognomen Anco is characteristic of Latin America and the Caribbean, particularly Peru, where it is quite a common surname, Argentina, where it is a rare surname, and Bolivia. Measured by absolute frequency, the name is most common in Peru, Argentina, and the United States. Much less frequently, Anco is the forename as well as the last name.