Last name Кастан (Castan 
, Casten 
, Кастан 
) , all around the world, is a common cognomen. The family name Кастан is habitual in France, where it is quite a rare surname, Spain, and Mexico. Very seldom, Кастан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castan | Philippines, Spain, France, Mexico, United States |
| Casten | Philippines, Spain, Argentina, Mexico, United States |
| Кастан | Russia, Ukraine |
| Castán | Brazil, Spain, Argentina, Mexico, United States |