Where does “wethar” come from?

wethar (Old Dutch) comes from Proto-West Germanic hwaþar, from Proto-Germanic hwaþeraz, from Proto-Indo-European kʷóteros, from Proto-Indo-European kʷos, from Proto-Indo-European kʷ- — The primary interrogative root.

Ancestry of “wethar”, step by step

StepLanguageWordMeaning
1Proto-West Germanichwaþarwhich
2Proto-Germanichwaþerazwhich, what
3Proto-Indo-Europeankʷóteroswhich of two
4Proto-Indo-EuropeankʷosSee *kʷis
5Proto-Indo-Europeankʷ-The primary interrogative root
Every word from Proto-Indo-European kʷ- →Every word from Proto-Indo-European kʷos →Every word from Proto-Indo-European kʷóteros →