Surname Koustantin (Koustantin 
) , all around the world, is an extremely rare family name. The surname Koustantin is habitual in Southern Europe, particularly Spain, where it is an extremely rare surname. Also, Koustantin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koustantin | Canada, Spain, United States |