Mstija, thank you so much for your interest. According to the OED (Oxford Dictionary of English) the word "slave" is derived from the " medieval Latin sclavus , sclava , identical with the racial name Sclavus (see Slav n. and adj.), the Slavonic population in parts of central Europe having been reduced to a servile condition by conquest; the transferred sense is clearly evidenced in documents of the 9th century. The form with initial scl- is also represented by older German schlav(e, sclav(e, German sklave. In English the reduction of scl- to sl- is normal, and the other Germanic languages show corresponding forms, as West Frisian slaef, North Frisian slaaw, Middle Dutch slave, slaef (Dutch slaaf), Middle Low German and Low German slave (hence Danish and Norwegian slave), older German slaf(e, Swedish slaf)." If you want a more cmplete history, the OED provides this reference: "The history of the words representing slave and Slav in late Greek, medieval Latin, and German, is very fully traced in Grimm's "Deutsches Wörterbuch" s.v. Sklave." The OED further provides the first known reference to "Slaves" in English in 1387 with the spelling of "Sclaves," which was modified to "Slave" ony in the 18th century. The word "Slav" has a very long history with spelling changes along the way. It is a ancient lineage known and recognized by both Latin and Greek authors with slight spelling modifications throughout the centuries as one would expect as the name passed from Latin to the Romance and Germanic languages.