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Latvian serbs
Avestan 𐬵𐬀𐬭𐬀𐬌𐬙𐬌 (cognate)
Avestan 𐬵𐬀𐬎𐬭𐬎𐬎𐬀𐬌𐬙𐬌 (mention)
Old English searu (cognate)
Ancient Greek ἥρως (cognate)
Proto-Indo-European *ser- (cognate)
Latin servō (cognate)
Lithuanian sárgas (cognate)
Latvian sargs (cognate)
Serbo-Croatian Србин (borrowed)

Latvian Serbija (suffix)
Latvian serbiete (suffix)
Latvian serbohorvātu (compound)
Latvian serbisks (suffix)