Surname ריהם (ריהם 
, Rihm 
) , in the entire world, is quite a rare cognomen. The surname ריהם is habitual in Western Europe, particularly Luxembourg, where it is quite a rare surname, Germany, and Switzerland. In absolute terms, it is commonest in Germany, the United States, and Switzerland. Very seldom, ריהם is the forename as well as the last name.