Surname Kyryak (Киряк 
, Кириак , Kyryak 
) , across the world, is a rare cognomen. The cognomen Kyryak is habitual in Bulgaria, where it is quite a rare surname, Russia, where it is a very rare surname, and Kazakhstan. In absolute terms, it most frequently occurs in Eastern Europe, particularly Bulgaria, Russia, and Ukraine. Likewise, Kyryak is the forename as well as the last name.