Last name Сайя (Saiya 
, Sayya 
, Saiia 
) , in all the world, is quite a rare family name. The family name Сайя is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, Indonesia, where it is a rare surname, and Thailand. In absolute terms, it is commonest in Indonesia, India, and Thailand. Also, Сайя is the forename as well as the last name.
Панова, and Касымбаева