Cognomen Кайхан (Kaihan 
, Kajhan 
, Kaikhan 
) , in the entire world, is quite a rare family name. The cognomen Кайхан is characteristic of Afghanistan, where it is quite a rare surname, North Macedonia, where it is a rare surname, and Austria. In absolute terms, this name is the most popular in Afghanistan, North Macedonia, and Thailand. More frequently, Кайхан is the forename as well as the last name.