Cognomen ריבאק (Rybak 
, Ribak 
, ריבאק ) , all around the world, is a common surname. The last name ריבאק is habitual in Poland, where it is quite a common surname, Latvia, where it is quite a rare surname, and Israel. In absolute terms, the name is most common in Poland, the United States, and Germany. Also, ריבאק is the forename as well as the last name.