Last name Кальс (Cals 
, Kals 
, Кальс) , all over the world, is quite a rare family name. The cognomen Кальс is habitual in Austria, where it is quite a rare surname, Netherlands, and Estonia, where it is a rare surname. In absolute terms, it is the most numerous in Western Europe, particularly France, Germany, and Austria. Very seldom, Кальс is the forename as well as the last name.