Surname เซีย (Sia 
, Tsia 
, เซีย 
) , all over the world, is a common cognomen. The surname เซีย is characteristic of Malaysia, where it is quite a common surname, Brunei, and Cayman Islands (explore the name in all countries). In absolute terms, it most frequently occurs in South-eastern Asia, particularly Malaysia, Philippines, and Indonesia. Likewise, เซีย is the forename as well as the last name.