Surname Уак (Уак 
, Uhac 
, Uhač ) , across the world, is a rare cognomen. The family name Уак is characteristic of Croatia, where it is quite a rare surname, Sweden, where it is a rare surname, and Kazakhstan, where it is a very rare surname. Measured by absolute frequency, it is commonest in Croatia, Sweden, and Canada. Much less frequently, Уак is the forename as well as the last name.