Family name ジア (Gia 
, Jiah 
, ジア 
) , throughout the world, is a common last name. The last name ジア is characteristic of Georgia, where it is a common surname, Bulgaria, where it is quite a common surname, and Macao, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Georgia, Vietnam, and Indonesia. Also, ジア is the forename as well as the last name.