Cognomen Валак (Vallak 
, Валак 
) , around the globe, is a very rare surname. The last name Валак is habitual in Australia, where it is a rare surname, Ukraine, where it is a very rare surname, and Russia, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in Australia, India, and Ukraine. Much less frequently, Валак is the forename as well as the last name.