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Last name Gia (Gia , جيا , 지아 ) , across the world, is a common cognomen. The last name Gia is habitual in Georgia, where it is a common surname, Bulgaria, where it is quite a common surname, and Macao, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Georgia, Vietnam, and Indonesia. Likewise, Gia is the forename as well as the last name.