Where does “wy” come from?

wy (Middle Welsh) comes from Old Welsh ui, from Proto-Celtic āwyom, from Proto-Indo-European h₂ōwyóm, from Proto-Indo-European h₂éwis — bird.

Ancestry of “wy”, step by step

wy traces back through two separate lines of ancestry.

via Old Welsh ui

StepLanguageWordMeaning
1Old Welshui—
2Proto-Celticāwyomegg
3Proto-Indo-Europeanh₂ōwyómegg
4Proto-Indo-Europeanh₂éwisbird

via English eyes

StepLanguageWordMeaning
1Englisheyesplural of eye; Third-person singular simple...
2Proto-Indo-Europeanéythe; demonstrative pronoun; this one, he
3Proto-Indo-Europeanh₁e-—

Words derived from “wy”

Every word from Proto-Indo-European h₂éwis →Every word from Proto-Indo-European h₂ōwyóm →Every word from Proto-Celtic āwyom →