Where does “Białystok” come from?

Białystok (English) comes from Polish Białystok, from Polish stok, from Polish stoczyć, from Polish toczyć, from Proto-Slavic točiti, from Proto-Slavic tekti, from Proto-Balto-Slavic tektej, from Proto-Indo-European tekʷ- — to run, to flow.

Ancestry of “Białystok”, step by step

StepLanguageWordMeaning
1PolishBiałystokwhite slope
2Polishstokslope
3Polishstoczyćto roll downwards
4Polishtoczyćto roll; to turn; to carry on, to conduct
5Proto-Slavictočitito cause to flow, run
6Proto-Slavictektito run, to flow
7Proto-Balto-Slavictektej—
8Proto-Indo-Europeantekʷ-to run, to flow
Every word from Proto-Indo-European tekʷ- →Every word from Proto-Balto-Slavic tektej →Every word from Proto-Slavic tekti →