Etymology

Borrowing from Italian ciao ‎(“hello; goodbye”), from Venetian ciao ‎(“hello; goodbye”, literally “your humble servant”), from Venetian s-ciao / s-ciavo ‎(“servant, slave”), from Medieval Latin sclavus ‎(“Slav, slave”), related also to Italian schiavo, English Slav, slave and old Venetian S-ciavón ‎(“Slav”), from Latin Sclavonia ‎(“Slavonia”).