Family name סיה (Sia 
, סיה 
) , all over the world, is a common surname. The surname סיה is habitual in Malaysia, where it is quite a common surname, Brunei, and Cayman Islands (explore the name in all countries). In absolute terms, the name is most common in South-eastern Asia, particularly Malaysia, Philippines, and Indonesia. Also, סיה is the forename as well as the last name.