Cognomen Khayyang (Khayyang , Хаиянг ) , in all the world, is an extremely rare family name. Much more frequently, Khayyang is the forename as well as the last name.
Хаиыанг, and Хайянг
Vangching
, Хаиянг 
) , in all the world, is an extremely rare family name. Much more frequently, Khayyang is the forename as well as the last name.