Last name Buliak (Буляк 
, Buliak 
) , across the world, is a rare surname. The cognomen Buliak is characteristic of Eastern Europe, particularly Slovakia, where it is quite a rare surname, Belarus, and Ukraine, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Buliak is the forename as well as the last name.