Etymology
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Slav (n.)

late 14c., Sclave, from Medieval Latin Sclavus (c. 800), from Byzantine Greek Sklabos (c. 580), from Proto-Slavic *sloveninu "a Slav," probably related to *slovo "word, speech," which suggests the name originally identified a member of a speech community (compare Old Church Slavonic Nemici "Germans," related to nemu "dumb;" Greek heterophonos "foreign," literally "of different voice;" and Old English þeode, which meant both "race" and "language").

Max Vasmer, the authority for Slavic etymologies, rejects a connection to *slava "glory, fame," which, however, influenced Slav via folk etymology. This is the -slav in personal names (such as Russian Miroslav, literally "peaceful fame;" Mstislav "vengeful fame;" Jaroslav "famed for fury;" Czech Bohuslav "God's glory;" Latinized Wenceslas "having greater glory"), perhaps from PIE root *kleu- "to hear."

In English, it was spelled Slave c. 1788-1866, influenced by French and German Slave. As an adjective from 1876.

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Mstislav 
Slavic masc. proper name, literally "vengeful fame," from Russian mstit' "to take revenge," from Proto-Slavic *misti "revenge," *mistiti "to take revenge," from PIE *mit-ti-, extended form of root *mei- (1) "to change, go, move;" for second element, see Slav.
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Slovene (n.)
Slavic people of Carinthia and Styria, 1883, from German Slowene, from Slovenec, the people's own name; see Slav. A survival of the old native designation of the Slavic people, compare Old Church Slavonic Slovene. Related: Slovenian.
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