Where does “brwsiau” come from?

brwsiau (Welsh) comes from Welsh brwsh, from English Brush, from Middle English brusshe, from Old French broisse, from Vulgar Latin brustia, from Icelandic bursti, from Proto-Germanic burstiz, from Proto-Germanic bʰurstís — top, tip, point.

Ancestry of “brwsiau”, step by step

brwsiau traces back through two separate lines of ancestry.

via Welsh brwsh

StepLanguageWordMeaning
1Welshbrwshbrush
2EnglishBrushAn implement consisting of multiple more or less flexible bristles or other filaments attached to a handle, used for any of various purposes including cleaning, painting, and arranging hair
3Middle Englishbrusshe—
4Old Frenchbroisse—
5Vulgar Latinbrustia—
6Icelandicburstibrush
7Proto-Germanicburstizbristle
8Proto-Germanicbʰurstís—
9Proto-Indo-Europeanbʰr̥s-tí-s—
10Proto-Indo-Europeanbʰers-top, tip, point

via Welsh Iau

StepLanguageWordMeaning
1WelshIauJupiter, Thursday
2Middle Welshieu—
3Brythonic*Yow—
4LatinIovem—
5Proto-Indo-Europeandyew-to be bright; sky, heaven
Every word from Proto-Indo-European bʰers- →Every word from Proto-Indo-European bʰr̥s-tí-s →Every word from Proto-Germanic bʰurstís →