Last name ルフ (Ruf 
, Rouff 
, ルフ 
) , worldwide, is a common cognomen. The last name ルフ is habitual in Western Europe, particularly Switzerland, where it is quite a common surname, Germany, and Austria, where it is quite a rare surname. In absolute terms, it is commonest in Germany, Switzerland, and the United States. Very seldom, ルフ is the forename as well as the last name.