Cognomen 穆夫 (Muff 
, 穆夫) , in the world, is quite a rare family name. The surname 穆夫 is habitual in Switzerland, where it is quite a common surname, Denmark, where it is quite a rare surname, and Germany, where it is a rare surname. Not in comparison with a country's population, it is commonest in Switzerland, the United States, and Germany. Very seldom, 穆夫 is the forename as well as the last name.