Where does “trigeiniau” come from?

trigeiniau (Welsh) comes from Welsh trigain, 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.

trigeiniau (Welsh): sixties

Definitions

  1. sixties

Ancestry of “trigeiniau”, step by step

trigeiniau traces back through two separate lines of ancestry.

via Welsh trigain

StepLanguageWordMeaning
1Welshtrigainsixty, three score; sixty
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)dḱm̥tiEvery word from Proto-Indo-European h₁wih₁ḱm̥tEvery word from Proto-Celtic wikantī