Family name کلاس (Classe 
, کلاس 
, Cluss 
) , in the entire world, is quite a rare cognomen. The surname کلاس is characteristic of Dominica, where it is quite a common surname, Algeria, where it is quite a rare surname, and the Dominican Republic. In absolute terms, it is the most numerous in Algeria, France, and Morocco. Very seldom, کلاس is the forename as well as the last name.