Where does “ruth,ruyth” come from?

ruth,ruyth (Middle Cornish) comes from Old Cornish rud, from Proto-Brythonic rrʉð, from Proto-Celtic roudos, from Proto-Indo-European h₁rewdʰ- — red.

Ancestry of “ruth,ruyth”, step by step

StepLanguageWordMeaning
1Old Cornishrud—
2Proto-Brythonicrrʉðred
3Proto-Celticroudosred
4Proto-Indo-Europeanh₁rewdʰ-red

Words derived from “ruth,ruyth”

Every word from Proto-Indo-European h₁rewdʰ- →Every word from Proto-Celtic roudos →Every word from Proto-Brythonic rrʉð →