Cognomen Šlager (Schlager 
, Šlager 
) , around the globe, is quite a common family name. The family name Šlager is habitual in Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Costa Rica. Not in comparison with a country's population, this name is the most popular in Austria, Germany, and the United States. Very seldom, Šlager is the forename as well as the last name.