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Surname Proano (Proaño , Proano ) , around the globe, is quite a rare cognomen. The family name Proano is habitual in Latin America and the Caribbean, particularly Antigua and Barbuda, where it is quite a common surname, Ecuador, and Peru, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Ecuador, the United States, and Mexico. Much less frequently, Proano is the forename as well as the last name.