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Surname Ollius (Oglio , Ollius ) , worldwide, is a rare last name. The cognomen Ollius is habitual in Latin America and the Caribbean, particularly Uruguay, where it is a rare surname, Brazil, and Argentina, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Brazil, Argentina, and Italy. Much less frequently, Ollius is the forename as well as the last name.