Surname Сайа (Saja 
, Saya 
, Saia 
) , in all the world, is a widespread family name. The family name Сайа is habitual in Brunei, where it is quite a common surname, the Democratic Republic of the Congo, and Indonesia. In absolute terms, this name is the most popular in Indonesia, the Democratic Republic of the Congo, and India. Likewise, Сайа is the forename as well as the last name.