Where does “nefoedd” come from?

nefoedd (Welsh) comes from Welsh nef, from Middle Welsh new, from Old Welsh nem, from Proto-Brythonic neβ̃, from Proto-Celtic nemos, from Proto-Indo-European nébʰos, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...

Ancestry of “nefoedd”, step by step

StepLanguageWordMeaning
1Welshnefheaven
2Middle Welshnew—
3Old Welshnemheaven
4Proto-Brythonicneβ̃heaven, sky
5Proto-Celticnemossky, heaven
6Proto-Indo-Europeannébʰoscloud; mist, moisture
7Proto-Indo-European-osCreates action nouns or result nouns from verbs;...
Every word from Proto-Indo-European -os →Every word from Proto-Indo-European nébʰos →Every word from Proto-Celtic nemos →