Where does “[[norrœnn]], [[norðrœnn]]” come from?

[[norrœnn]], [[norðrœnn]] (Old Norse) comes from Proto-Germanic nurþrōnijaz, from Proto-Germanic nurþraz, from Proto-Indo-European *nér — below the surface, below.

Ancestry of “[[norrœnn]], [[norðrœnn]]”, step by step

StepLanguageWordMeaning
1Proto-Germanicnurþrōnijaznorthern
2Proto-Germanicnurþraznorth, northern
3Proto-Indo-European*nérbelow the surface, below

Words derived from “[[norrœnn]], [[norðrœnn]]”

Every word from Proto-Indo-European *nér →Every word from Proto-Germanic nurþraz →Every word from Proto-Germanic nurþrōnijaz →