Where does “diweddarach” come from?

diweddarach (Welsh) comes from Welsh ach, from Proto-Celtic akkā, from Proto-Indo-European h₂ekkeh₂.

Ancestry of “diweddarach”, step by step

diweddarach traces back through two separate lines of ancestry.

via Welsh ach

StepLanguageWordMeaning
1Welshachkinship; pedigree, ancestry; lineage
2Proto-Celticakkā
3Proto-Indo-Europeanh₂ekkeh₂

via Welsh diweddar

StepLanguageWordMeaning
1Welshdiweddarlate
2Welshdiweddend
Every word from Proto-Indo-European h₂ekkeh₂