Mstislav or Mścisław (Polish) - is a very old Slavic origin given name, consists of two elements: msti - "vengeance" and slav - "glory, fame". The feminine forms are Mstislava and Mścisława.
List of people with the given name Mstislav
Royalty
Mstislav of Chernigov (d. 1036), or Mstislav the Brave, son of Vladimir the Great Mstislav I of Kiev (d. 1125), or Mstislav the Great, last sovereign of united Kievan Rus Mstislav II of Kiev (? - 1172) Mstislav III of Kiev, or Mstislav Romanovich the Old Mstislav the Eyeless (d. 1178), of Rostov and Novgorod Mstislav Rostislavich (d. 1180), "the Brave", of Smolensk Mstislav Mstislavich (d. 1228), or Mstislav the Bold, of Novgorod Mstislav Danylovich (d. aft 1300), King Danylo's son
Others
Mstislav Dobuzhinsky (1875–1957), Russian-Lithuanian artist
Mstislav Keldysh (1911–1978), Soviet scientist in the field of mathematics and mechanics Mstislav Rostropovich (1927–2007), Russian cellist and conductor