Servian

1754 (n.), "a native or inhabitant of Servia," an old form of Serbia, which is the correct form; 1723 as an adjective, "pertaining or belonging to Servia or its inhabitants," from Medieval Latin Servia, from Serbian Serb (see Serb). The form is perhaps by confusion in Medieval Latin with servius. The English word formerly was sometimes extended loosely to Bosnians, Croatians, etc.