Family name Мастонаи (Мастонаи 
) , in the entire world, is a very rare last name. The last name Мастонаи is habitual in Eastern Europe, particularly Russia, where it is an extremely rare surname. Likewise, Мастонаи is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Мастонаи | Russia |