Where does “uniawn” come from?

uniawn (Welsh) comes from Welsh un, from Middle Welsh un, from Proto-Brythonic ʉn, from Proto-Celtic oinos, from Proto-Indo-European óynos — one; single.

Ancestry of “uniawn”, step by step

uniawn traces back through two separate lines of ancestry.

via Welsh un

StepLanguageWordMeaning
1Welshunonly; one; one, individual
2Middle Welshunone
3Proto-Brythonicʉnone
4Proto-Celticoinosone
5Proto-Indo-Europeanóynosone; single

via Welsh iawn

StepLanguageWordMeaning
1Welshiawnvery; amends; compensation
Every word from Proto-Indo-European óynosEvery word from Proto-Celtic oinosEvery word from Proto-Brythonic ʉn