Where does “Bryansk” come from?

Bryansk (English) comes from Russian Брянск, from Old East Slavic Дьбрꙗньскъ, from Proto-Slavic dьbrь, from Latin Dubris, from Brythonic Dubras, from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ- — smoke; mist, haze.

Ancestry of “Bryansk”, step by step

StepLanguageWordMeaning
1RussianБрянск—
2Old East SlavicДьбрꙗньскъ—
3Proto-Slavicdьbrьvalley, ravine
4LatinDubrisnow Dover
5BrythonicDubras—
6Proto-Celticdubrosdark; water
7Proto-Indo-Europeandʰubʰrósdeep
8Proto-Indo-Europeandʰewbʰ-deep
9Proto-Indo-Europeandʰewh₂-smoke; mist, haze
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Indo-European dʰewbʰ- →Every word from Proto-Indo-European dʰubʰrós →