Surname Mstislav (Мстислав 
, Mstislav 
, Mścisław 
) , in the entire world, is a very rare family name. The last name Mstislav is habitual in Israel, where it is a very rare surname, Kyrgyzstan, and Georgia. Not in comparison with a country's population, it is the most numerous in Russia, Israel, and Kyrgyzstan. Predominantly, Mstislav is the forename as well as the last name.