Where does “dwī” come from?

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

Ancestry of “dwī”, step by step

dwī traces back through two separate lines of ancestry.

via Proto-Indo-European dwih₂

StepLanguageWordMeaning
1Proto-Indo-Europeandwih₂—
2Proto-Indo-Europeandwóh₁two

via Proto-Indo-European dw-ih₂

StepLanguageWordMeaning
1Proto-Indo-Europeandw-ih₂—

Words derived from “dwī”

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwih₂ →