Worldwide, Mstislavskii (Mstislavskii , Мстиславский ) is an extremely rare unknown gender first name. Predominantly, Mstislavskii is the last name as well as the forename.
Мстиславський
Mr
, Мстиславский 
) is an extremely rare unknown gender first name. Predominantly, Mstislavskii is the last name as well as the forename.