Where does “deugeiniau” come from?

deugeiniau (Welsh) comes from Welsh deugain, from Welsh ugain, from Old Welsh uceint, from Proto-Brythonic ʉgėnt, from Proto-Celtic wikantī, from Proto-Indo-European h₁wih₁ḱm̥t, from Proto-Indo-European dwi(h₁)dḱm̥ti — two tens; two decades; twenty; two-ten.

deugeiniau (Welsh): forties

Definitions

  1. forties

Ancestry of “deugeiniau”, step by step

deugeiniau traces back through two separate lines of ancestry.

via Welsh deugain

StepLanguageWordMeaning
1Welshdeugainforty, two score; forty
2Welshugaintwenty; score
3Old Welshuceint—
4Proto-Brythonicʉgėnt—
5Proto-Celticwikantītwenty
6Proto-Indo-Europeanh₁wih₁ḱm̥t—
7Proto-Indo-Europeandwi(h₁)dḱm̥titwo tens; two decades; twenty; two-ten

via Welsh Iau

StepLanguageWordMeaning
1WelshIauJupiter, Thursday
2Middle Welshieu—
3Brythonic*Yow—
4LatinIovem—
5Proto-Indo-Europeandyew-to be bright; sky, heaven
Every word from Proto-Indo-European dwi(h₁)dḱm̥ti →Every word from Proto-Indo-European h₁wih₁ḱm̥t →Every word from Proto-Celtic wikantī →