In all the world, Костен (Kosten 
, Костен 
) is a very rare mostly male, but infrequently feminine forename. The first name Костен is habitual in Southern Asia, particularly India, where it is an extremely rare mostly male, but infrequently girly name. Predominantly, Костен is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kosten | Germany, Indonesia, United States, Argentina, Netherlands |
| Костен | Kazakhstan, Russia, Ukraine |
C-Tin, Constantijn, Constantin, Constantine, Constantino, Constantinus, Constantí, Costantino, Costantinos, Costas, Kanstancin, Kanstantin, Kanstantsin, Konstantin, Konstantinas, Konstantinos, Konstantins, Konstanty, Konstantyn, Konstantín, Konstantínos, Konstantīns, Kosta, Kostas, Kostiantyn, Kostjantyn, Kostyantyn, Κωνσταντίνος, Κώστας, Ντίνος, Канстанцін, Константи, Константин, Константино, Константинос, Константинс, Константы, Константій, Константінос, Коста, Костантино, Костя, Костянтин, קונסטנטין, قسطنطين, كونستانتين, კონსტანტინე, and コスタ
Костен is also a name for the fictitious and mythical characters: Konstantin Gavrilovich Treplyov , the character in the play "The Seagull" and Konstantin Dmitrievich Levin , the character in Anna Karenina.