Last name Кастэн (Castaing 
, Кастэн 
) , in the world, is quite a rare family name. The family name Кастэн is habitual in Monaco, where it is quite a common surname, France, where it is quite a rare surname, and Paraguay. In absolute terms, the name is most common in France, the United States, and Paraguay. Much less frequently, Кастэн is the forename as well as the last name.