Serb (n.)youdaoicibaDictYouDict[Serb 词源字典]
1813, but in reference to the Wends; 1861 as "native of Serbia," from Serbian Srb, perhaps from a root meaning "man." Serbian is attested from 1848 as a noun, 1876 as an adjective. More common in 19c. was Servian.[Serb etymology, Serb origin, 英语词源]