Where does “ugor” come from?
ugor (Serbo-Croatian) comes from Proto-Slavic ǫgořь, from Proto-Balto-Slavic angurjas, from Proto-Indo-European *h₂engʷʰuryos, from Proto-Indo-European h₂éngʷʰis — snake.
ugor (Serbo-Croatian): conger; eel
Ancestry of “ugor”, step by step