Family name Демут (Demuth 
, Демут 
) , worldwide, is quite a common cognomen. The surname Демут is habitual in Aland Islands, where it is quite a common surname, Luxembourg, and Switzerland, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Germany, the United States, and Switzerland. Very seldom, Демут is the forename as well as the last name.