Where does “Bieluch” come from?

Bieluch (Polish) comes from Polish Biel, from Old Polish biel, from Proto-Slavic bělъ, from Proto-Indo-European bʰēlHs — white surface or stain.

Ancestry of “Bieluch”, step by step

StepLanguageWordMeaning
1PolishBielwhite
2Old Polishbielmud, swamp
3Proto-Slavicbělъwhite
4Proto-Indo-EuropeanbʰēlHswhite surface or stain
Every word from Proto-Indo-European bʰēlHs →Every word from Proto-Slavic bělъ →Every word from Old Polish biel →