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Last name Arza (Arza , Арза , ارزة ) , around the globe, is quite a common cognomen. The cognomen Arza is characteristic of Latin America and the Caribbean, particularly Paraguay, where it is quite a common surname, Bolivia, where it is quite a rare surname, and Panama. In absolute terms, the name is most common in Paraguay, Indonesia, and Argentina. Much less frequently, Arza is the forename as well as the last name.