Where does “dau ddeg saith” come from?

dau ddeg saith (Welsh) comes from Welsh saith, from Middle Welsh seith, from Proto-Brythonic seiθ, from Proto-Celtic sextam, from Proto-Indo-European septḿ̥ — seven.

dau ddeg saith (Welsh): twenty-seven

Definitions

  1. twenty-seven

Ancestry of “dau ddeg saith”, step by step

dau ddeg saith traces back through 3 separate lines of ancestry.

via Welsh saith

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

via Welsh dau

StepLanguageWordMeaning
1Welshdautwo
2Proto-Brythonic*dowtwo
3Proto-Celtic*duwotwo
4Proto-Indo-Europeandwóh₁two

via Welsh deg

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