Last name Kasiyan (Kasiyan 
, Касиян 
) , all around the world, is a rare surname. The cognomen Kasiyan is habitual in Moldova, where it is quite a rare surname, Latvia, where it is a rare surname, and Romania. Not in comparison with a country's population, the name is most common in Indonesia, Russia, and Moldova. Also, Kasiyan is the forename as well as the last name.