Where does “diwarr” come from?

diwarr (Cornish) comes from Cornish diw, from Proto-Celtic dwī, from Proto-Indo-European dwih₂, from Proto-Indo-European dwóh₁ — two.

Ancestry of “diwarr”, step by step

diwarr traces back through two separate lines of ancestry.

via Cornish diw

StepLanguageWordMeaning
1Cornishdiwtwo
2Proto-Celticdwī—
3Proto-Indo-Europeandwih₂—
4Proto-Indo-Europeandwóh₁two

via Cornish garr

StepLanguageWordMeaning
1Cornishgarrleg
2Proto-Celticgarrāleg
Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwih₂ →Every word from Proto-Celtic dwī →