Where does “dwáH” come from?

dwáH (Proto-Indo-Aryan) comes from Proto-Indo-Iranian dwáH, from Proto-Indo-European dwóh₁ — two.

Ancestry of “dwáH”, step by step

StepLanguageWordMeaning
1Proto-Indo-IraniandwáHtwo
2Proto-Indo-Europeandwóh₁two
Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-Iranian dwáH →