Family name 罗勒 (Roller 
, Rohrer , Rorer 
) , in the world, is a common surname. The family name 罗勒 is characteristic of Switzerland, where it is quite a common surname, Eswatini, and Liechtenstein (explore the name in all countries). In absolute terms, it is the most numerous in the United States, Germany, and Switzerland. Much less frequently, 罗勒 is the forename as well as the last name.