Where does “O'Sullivan” come from?

O'Sullivan (English) comes from Irish Ó Súilleabháin, from Irish Ó, from Irish ua, from Old Irish áue, from Primitive Irish ᚐᚃᚔ, from Proto-Celtic awyos, from Proto-Indo-European h₂ewh₂yos — grandfather.

Ancestry of “O'Sullivan”, step by step

StepLanguageWordMeaning
1IrishÓ Súilleabháin—
2IrishÓAlternative form of ó used in surnames
3IrishuaArchaic form of ó
4Old Irisháuegrandson
5Primitive Irishᚐᚃᚔdescendant
6Proto-Celticawyos—
7Proto-Indo-Europeanh₂ewh₂yosgrandfather

Words derived from “O'Sullivan”

Every word from Proto-Indo-European h₂ewh₂yos →Every word from Proto-Celtic awyos →Every word from Primitive Irish ᚐᚃᚔ →