Where does “Thronfolgerin” come from?

Thronfolgerin (German) comes from German Thronfolger, from German Folger, from German folgēn, from Middle High German volgen, from Old High German folgēn, from Proto-West Germanic folgēn, from Proto-Germanic fulgāną, from Proto-Germanic fullaz — to fill.

Ancestry of “Thronfolgerin”, step by step

StepLanguageWordMeaning
1GermanThronfolgerheir to the throne
2GermanFolgeragent noun of folgen; follower
3Germanfolgēnto follow on the same path or in a sequence
4Middle High Germanvolgen
5Old High Germanfolgēnto follow
6Proto-West Germanicfolgēnto follow
7Proto-Germanicfulgānąto follow
8Proto-Germanicfullazfull; the whole, the entire
9Proto-Indo-Europeanpl̥h₁nósfull
10Proto-Indo-Europeanpleh₁-to fill
Every word from Proto-Indo-European pleh₁-Every word from Proto-Indo-European pl̥h₁nósEvery word from Proto-Germanic fullaz