Family name 索西亚 (Soscia 
, 索西亚) , in all the world, is a rare cognomen. The cognomen 索西亚 is characteristic of Italy, where it is a rare surname, France, and Canada. Measured by absolute frequency, it is commonest in Italy, the United States, and France. Much less frequently, 索西亚 is the forename as well as the last name.