Surname كالوس (كالوس 
, Kalous 
, Kallosh 
) , all around the world, is quite a rare last name. The cognomen كالوس is habitual in Czechia, where it is quite a common surname, Austria, where it is a rare surname, and Slovakia. In absolute terms, this name is the most popular in Czechia, the United States, and Germany. Very seldom, كالوس is the forename as well as the last name.