Where does “Glyndŵr” come from?

Glyndŵr (Welsh) comes from Welsh dŵr, from Middle Welsh dwfyr, from Proto-Brythonic duβr, from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “Glyndŵr”, step by step

Glyndŵr traces back through two separate lines of ancestry.

via Welsh dŵr

StepLanguageWordMeaning
1Welshdŵrwater; Soft mutation of tŵr
2Middle Welshdwfyrwater
3Proto-Brythonicduβrwater
4Proto-Celticdubrosdark; water
5Proto-Indo-Europeandʰubʰrósdeep
6Proto-Indo-Europeandʰewbʰ-deep
7Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via Welsh glyn

StepLanguageWordMeaning
1Welshglynglen, valley
2Proto-Brythonicglɨnnglen, dale, valley
3Proto-Celticglendosvalley
4Proto-Indo-Europeanglend-shore
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Indo-European dʰewbʰ- →Every word from Proto-Indo-European dʰubʰrós →