Surname Iust (Юст 
, Iust 
) , in the world, is a rare last name. The family name Iust is habitual in Kazakhstan, where it is quite a rare surname, Russia, where it is a rare surname, and Ukraine. Very seldom, Iust is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Юст | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |
| Iust | Iran, Ukraine, United States, Brazil, Italy |