Last name Lösen (Lauss 
, Lösen) , across the world, is a rare family name. The cognomen Lösen is habitual in Austria, where it is quite a rare surname, Germany, where it is a very rare surname, and Italy. Not in comparison with a country's population, the name is most common in Austria, Germany, and the United States. Very seldom, Lösen is the forename as well as the last name.