Where does “un deg saith” come from?

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

un deg saith (Welsh): seventeen

Definitions

  1. seventeen

Ancestry of “un deg saith”, step by step

un deg saith traces back through 3 separate lines of ancestry.

via Welsh un

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

via Welsh saith

StepLanguageWordMeaning
1Welshsaithseven
2Middle Welshseithseven
3Proto-Brythonicseiθseven
4Proto-Celticsextamseven
5Proto-Indo-Europeanseptḿ̥seven

via Welsh deg

StepLanguageWordMeaning
1Welshdegten; Soft mutation of teg
2Proto-Brythonicdegten
3Proto-Celticdekamten
4Proto-Indo-Europeandéḱm̥ten
Every word from Proto-Indo-European óynos →