Last name Сайян (Saiyan 
, Sayyan 
, Сайян 
) , all around the world, is quite a rare family name. The cognomen Сайян is characteristic of Indonesia, where it is a rare surname, Bangladesh, and Saudi Arabia. In absolute terms, it is commonest in Indonesia, Bangladesh, and India. Likewise, Сайян is the forename as well as the last name.