Where does “twīfel” come from?

twīfel (Old Frisian) comes from Proto-West Germanic twīfl, from Proto-Germanic twīflaz, from Proto-Indo-European dwóh₁ — two.

Ancestry of “twīfel”, step by step

StepLanguageWordMeaning
1Proto-West Germanictwīfldoubt
2Proto-Germanictwīflazdoubt
3Proto-Indo-Europeandwóh₁two

Words derived from “twīfel”

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Germanic twīflaz →Every word from Proto-West Germanic twīfl →