Cognomen シア (Xia 
, Cyr 
, Sia ) , in the entire world, is a prevalent surname. The last name シア is characteristic of Cayman Islands, where it is a common surname, China, where it is quite a common surname, and Malaysia (explore the name in all countries). In absolute terms, this name is the most popular in China, Malaysia, and the United States. Much less frequently, シア is the forename as well as the last name.