Cognomen Kritsak (Kritsak 
, ฤาศักดิ์ , Крицак 
) , in all the world, is a rare surname. The last name Kritsak is habitual in Ukraine, where it is a rare surname, Greece, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Ukraine, Russia, and Thailand. Much less frequently, Kritsak is the forename as well as the last name.