Reconstruction:Proto-Slavic/sьrbъ

From Proto-Indo-European *ser- (“to watch over, protect”).

Indo-European cognates include Avestan 𐬵𐬀𐬭𐬀𐬌𐬙𐬌‎ (haraⁱti), 𐬵𐬀𐬎𐬭𐬎𐬎𐬀𐬌𐬙𐬌‎ (ha^uruuaⁱti, “he guards”), Proto-Scythian *harv- (> *xъrvatъ, *xъrvatinъ).

*sьrbъ m

1. ally
2. kinsperson (used as an endonym)

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• *pasьrbъ
• *sьrbьskъ
• *sьrbьstvo
• *sьrbovati

• East Slavic:
  • ⇒ Ukrainian: присербитися (pryserbytysja, “to join”)
  • Russian: серб (serb)
• South Slavic:
  • Old Serbian: срьбинь, срьблинь
    • Serbo-Croatian:

      Cyrillic script: ср̏б, Ср̏бин, ср̏бљин

      Latin script: sȑb, Sȑbin, sȑbljin

• West Slavic:
  • Sorbian:
    • Upper Sorbian: serb (“Sorb, Kashub”)
    • Lower Sorbian: serb (“Sorb, Kashub”)
• Other:
  • Greek: Σέρβιοι (“East Slavic tribe”), Σέρβοι
  • Middle Latin: Zribia (“Meissen”)
  • Romanian: sârb

• Vasmer, Max (1964–1973), “серб”, in Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), transl. & suppl. by Oleg Trubachyov, Moscow: Progress
• Vasmer, Max (1964–1973), “пасерб”, in Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), transl. & suppl. by Oleg Trubachyov, Moscow: Progress