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Last name Castaño (Castaño , Castano , Кастаньо ) , around the globe, is a widespread family name. The last name Castaño is characteristic of Latin America and the Caribbean, particularly Colombia, where it is a common surname, Argentina, where it is quite a common surname, and Aruba (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Colombia, Argentina, and Spain. Very seldom, Castaño is the forename as well as the last name.