Where does “seithawd” come from?

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

seithawd (Welsh): septet

Definitions

  1. septet

Ancestry of “seithawd”, step by step

seithawd traces back through two separate lines of ancestry.

via Welsh saith

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

via Welsh awd

StepLanguageWordMeaning
1Welshawd
Every word from Proto-Indo-European septḿ̥