Where does “no” come from?

no (Welsh) comes from Welsh o, from Proto-Brythonic o, from Proto-Celtic *au, from Proto-Indo-European h₂ew, from Proto-Indo-European ǵʰe — Postpositional intensifying particle: indeed, at any rate, in fact.

Ancestry of “no”, step by step

StepLanguageWordMeaning
1Welshohe, him; of; from
2Proto-Brythonicofrom
3Proto-Celtic*auaway from
4Proto-Indo-Europeanh₂ewaway from, off; again
5Proto-Indo-EuropeanǵʰePostpositional intensifying particle: indeed, at any rate, in fact

Words derived from “no”

Every word from Proto-Indo-European ǵʰe →Every word from Proto-Indo-European h₂ew →Every word from Proto-Celtic *au →