Family name Костя (Костя 
, Kostya 
, Kostia ) , in the entire world, is quite a common last name. The surname Костя is characteristic of Moldova, where it is quite a rare surname, Belarus, and Armenia. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Russia, Belarus, and Ukraine. More frequently, Костя is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Костя | Kazakhstan, Uzbekistan, Russia, Moldova, Belarus |
| Kostya | Uzbekistan, Russia, Poland, Belarus, Ukraine |
| Kostia | Kazakhstan, Russia, Poland, Belarus, Ukraine |
| Kostja | Russia, Latvia, United States, Germany, Ukraine |
C-Tin, Constantijn, Constantin, Constantine, Constantino, Constantinus, Constantí, Costantino, Costantinos, Costas, Costea, 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, Костен, Костянтин, קונסטנטין, قسطنطين, كونستانتين, კონსტანტინე, and コスタ