Cognomen Канстантин (Канстантин 
, Kanstantin 
) , in all the world, is a very rare family name. The last name Канстантин is characteristic of Armenia, where it is a rare surname, Greece, where it is a very rare surname, and Kyrgyzstan. More frequently, Канстантин is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Канстантин | Kyrgyzstan, Kazakhstan, Armenia, Russia |
| Kanstantin | Russia, Belarus, United States, India, Greece |