Family name سيا (Sia 
, Cea 
, Seiya ) , all around the world, is a common surname. The last name سيا is characteristic of Taiwan, where it is quite a common surname, Malaysia, and Brunei (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Philippines, Malaysia, and Taiwan. Much less frequently, سيا is the forename as well as the last name.