Where does “Niederösterreicherin” come from?

Niederösterreicherin (German) comes from German Niederösterreicher, from German Niederösterreich, from German Österreich, from Middle High German Osteriche, from Old High German Ostarrîchi, from Old High German rīhhi, from Proto-West Germanic rīkī, from Proto-Germanic rīkijaz — to straighten, to right oneself; right; just.

Ancestry of “Niederösterreicherin”, step by step

StepLanguageWordMeaning
1GermanNiederösterreichera native or inhabitant of Lower Austria, a state of Austria
2GermanNiederösterreich
3GermanÖsterreichAustria; eastern empire
4Middle High GermanOsteriche
5Old High GermanOstarrîchi
6Old High Germanrīhhirich, mighty; power, might, empire; realm
7Proto-West Germanicrīkīmighty, powerful; rich; kingdom, realm
8Proto-Germanicrīkijazkingly, royal, noble; mighty, powerful; rich
9Proto-Germanicrīksking, ruler
10Proto-Celticrīxsking
11Proto-Indo-Europeanh₃rḗǵsking, ruler
12Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just
Every word from Proto-Indo-European h₃reǵ-Every word from Proto-Indo-European h₃rḗǵsEvery word from Proto-Celtic rīxs