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Last name Siza (Siza , سيزا , Сіза ) , across the world, is quite a rare family name. The cognomen Siza is habitual in Colombia, where it is quite a rare surname, Madagascar, where it is a rare surname, and the Democratic Republic of the Congo. In absolute terms, it is the most numerous in Colombia, the Democratic Republic of the Congo, and South Africa. Also, Siza is the forename as well as the last name.