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Last name Billi (Billi , בילי , Билли ) , around the world, is quite a common cognomen. The cognomen Billi is habitual in Southern Europe, particularly San Marino, where it is quite a common surname, Italy, where it is quite a rare surname, and Greece. Not in comparison with a country's population, this name is the most popular in Italy, India, and Indonesia. Also, Billi is the forename as well as the last name.