Surname Хайян (Hayyan 
, Hajjan 
, Хайян 
) , all over the world, is quite a rare last name. The cognomen Хайян is characteristic of Aland Islands, where it is quite a common surname, Bahrain, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, it most frequently occurs in Malaysia, Indonesia, and Saudi Arabia. Also, Хайян is the forename as well as the last name.