Where does “nithere” come from?

nithere (Middle English) comes from Old English niþera, from Proto-Germanic niþeraz, from Proto-Indo-European h₁én — in.

Ancestry of “nithere”, step by step

StepLanguageWordMeaning
1Old Englishniþeralower, lowest, under; inferior
2Proto-Germanicniþeraz—
3Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₁én →Every word from Proto-Germanic niþeraz →Every word from Old English niþera →
nithere — Etymology, Origin & Word History | Etymology Explorer