Family name Kostiantyn (Костянтин 
, Kostiantyn 
, Костянтын ) , globally, is a common cognomen. The surname Kostiantyn is characteristic of Kazakhstan, where it is quite a common surname, Belarus, and Ukraine, where it is quite a rare surname. In absolute terms, this name is the most popular in Kazakhstan, Russia, and Belarus. More prevalently, Kostiantyn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Костянтин | Ukraine, Russia |
| Kostiantyn | Ukraine, United States, Spain, Moldova, Poland |
| Костянтын | Russia |
| Петрович | Ukraine, Kazakhstan, Russia, Belarus, Azerbaijan |
C-Tin, Constantijn, Constantin, Constantine, Constantino, Constantinus, Constantí, Costantinos, Costas, Konstantin, Konstantinas, Konstantinos, Konstanty, Konstantyn, Konstantín, Konstantínos, Kost, Kosta, Kostas, Kostjantyn, Kostyantyn, Κωνσταντίνος, Κώστας, Ντίνος, Канстанцін, Константи, Константин, Константино, Константинос, Константы, Константій, Константінос, Коста, Костен, Костиантын, Кость, Костя, קונסטנטין, قسطنطين, كونستانتين, კონსტანტინე, and コスタ
Gura, Shevchuk, Sydorenko, Kolesnyk, Pavlenko, Poliakov, Romaniuk, Denysenko, Diachenko, Gorbunov, Lakhonia, Vasyliev, Volobuiev, Mironchyk, Kartashov, Kovalchuk, Shevchenko, Aleksieiev, Bondarenko, Kharchenko, Kravchenko, Nesterenko, Zazvonov, Iurchak, Iantsen, Lunehov, Savin, Butov, Koval, Popov, Rybak, Danko, Galan, Zubov, Melnyk, Shkoda, Marianovskyi, Kostin, Tiurin, Volkov, Ivanov, Morozov, Alerhush, Karakis, Kliuiev, Pataman, Radzivliuk, Demchuk, Prodan, and Konstantynov