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Cognomen Costi (Costi , كوستي , Кости ) , in all the world, is a common last name. The family name Costi is characteristic of Sudan, where it is quite a common surname, Cyprus, and Italy, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Sudan, Italy, and Romania. Very seldom, Costi is the forename as well as the last name.