Where does “Ó Tiarnaigh” come from?

Ó Tiarnaigh (Irish) comes from Irish tiarna, from Old Irish tigerna, from Old Irish tigernae, from Old Irish tigern, from Proto-Celtic tigernos, from Proto-Celtic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Ó Tiarnaigh”, step by step

StepLanguageWordMeaning
1Irishtiarnalord
2Old Irishtigerna—
3Old Irishtigernaelord
4Old Irishtigern—
5Proto-Celtictigernoslord, ruler
6Proto-Celtic-īnosOf or pertaining to; -ine
7Proto-Indo-European-iHnosCreates adjectives of materials
8Proto-Indo-European-no-adjectival suffix

Words derived from “Ó Tiarnaigh”

Every word from Proto-Indo-European -no- →Every word from Proto-Celtic -īnos →Every word from Proto-Celtic tigernos →