Where does “birke” come from?

birke (Old Saxon) comes from Proto-West Germanic birkijā, from Proto-Germanic birkijǭ, from Proto-Indo-European bʰerHǵos — birch.

Ancestry of “birke”, step by step

StepLanguageWordMeaning
1Proto-West Germanicbirkijābirch
2Proto-Germanicbirkijǭbirch
3Proto-Indo-EuropeanbʰerHǵosbirch
Every word from Proto-Indo-European bʰerHǵos →Every word from Proto-Germanic birkijǭ →Every word from Proto-West Germanic birkijā →