Surname Klagen (Klaga 
, Kragi 
, Klage 
) , throughout the world, is a rare last name. The family name Klagen is habitual in Germany, where it is a rare surname, Poland, where it is a very rare surname, and Israel. In absolute terms, the name is most common in Germany, the United States, and Poland. Very seldom, Klagen is the forename as well as the last name.