Cognomen Mazko (Mazko 
, Мазько 
) , in the world, is a rare family name. The last name Mazko is characteristic of Belarus, where it is quite a rare surname, Estonia, and Ukraine, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Belarus, Russia, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Mazko | Estonia, Russia, Argentina, Belarus, Germany |
| Мазько | Belarus, Kazakhstan, Russia, Ukraine |