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Surname Niella (Niella ) , in the entire world, is quite a rare last name. The last name Niella is characteristic of Paraguay, where it is quite a rare surname, Argentina, where it is a rare surname, and Spain, where it is a very rare surname. Measured by absolute frequency, it is commonest in Latin America and the Caribbean, particularly Paraguay, Argentina, and Brazil. Very seldom, Niella is the forename as well as the last name.