Where does “Bielsko-Biała” come from?

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

Ancestry of “Bielsko-Biała”, step by step

StepLanguageWordMeaning
1PolishBielsko-Biała—
2PolishBielsko—
3PolishBielwhite
4Old Polishbielmud, swamp
5Proto-Slavicbělъwhite
6Proto-Indo-EuropeanbʰēlHswhite surface or stain
Every word from Proto-Indo-European bʰēlHs →Every word from Proto-Slavic bělъ →Every word from Old Polish biel →