Where does “tvinnr” come from?

tvinnr (Old Norse) comes from Proto-Germanic twinaz, from Proto-Indo-European dwino-, from Proto-Indo-European dwóh₁ — two.

Ancestry of “tvinnr”, step by step

StepLanguageWordMeaning
1Proto-Germanictwinazdouble, two each; twin
2Proto-Indo-Europeandwino-twin
3Proto-Indo-Europeandwóh₁two

Words derived from “tvinnr”

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwino- →Every word from Proto-Germanic twinaz →