Where does “nei” come from?

nei (Middle Welsh) comes from Proto-Brythonic nei, from Proto-Celtic neɸūss, from Proto-Indo-European népōts — grandson; descendant; nephew.

Ancestry of “nei”, step by step

StepLanguageWordMeaning
1Proto-Brythonicneinephew
2Proto-Celticneɸūssnephew
3Proto-Indo-Europeannépōtsgrandson; descendant; nephew

Words derived from “nei”

Every word from Proto-Indo-European népōts →Every word from Proto-Celtic neɸūss →Every word from Proto-Brythonic nei →