Where does “Dyffryn” come from?

Dyffryn (English) comes from Welsh dyffryn, from Welsh hynt, from Middle Welsh hint, from Proto-Brythonic hɨnt, from Proto-Celtic sentus, from Proto-Indo-European sent-, from Proto-Indo-European h₁es- — to be.

Ancestry of “Dyffryn”, step by step

StepLanguageWordMeaning
1Welshdyffrynvalley, dale
2Welshhyntcourse, way
3Middle Welshhint—
4Proto-Brythonichɨntpath, way
5Proto-Celticsentuspath, way
6Proto-Indo-Europeansent-to head for, to go, to travel; to feel
7Proto-Indo-Europeanh₁es-to be
Every word from Proto-Indo-European h₁es- →Every word from Proto-Indo-European sent- →Every word from Proto-Celtic sentus →