Cognomen Бирг (Birg 
, Бирг 
, Byrg ) , around the globe, is a rare family name. The surname Бирг is characteristic of Liechtenstein, where it is quite a rare surname, Austria, and Croatia, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, Austria, and the United States. Very seldom, Бирг is the forename as well as the last name.