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Throughout the world, Kostantin (Костантин
, Kostantin
) is quite a rare boy's first name. The given name Kostantin is habitual in Reunion, where it is quite a common male name, Greece, where it is quite a rare masculine name, and Bulgaria. Not in comparison with a country's population, the name is most common in Russia, Greece, and Bulgaria. Much less frequently, Kostantin is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Костантин | Kazakhstan, Russia, Poland, Bulgaria, Ukraine |
| Kostantin | Tanzania, Greece, Bulgaria, Reunion, North Macedonia |