Where does “teyrniaid” come from?

teyrniaid (Welsh) comes from Welsh teyrn, from Proto-Celtic tigernos, from Proto-Celtic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “teyrniaid”, step by step

StepLanguageWordMeaning
1Welshteyrnsovereign, monarch; king
2Proto-Celtictigernoslord, ruler
3Proto-Celtic-īnosOf or pertaining to; -ine
4Proto-Indo-European-iHnosCreates adjectives of materials
5Proto-Indo-European-no-adjectival suffix
Every word from Proto-Indo-European -no- →Every word from Proto-Celtic -īnos →Every word from Proto-Celtic tigernos →