Where does “Ó Dochartaigh” come from?

Ó Dochartaigh (Irish) comes 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 “Ó Dochartaigh”, step by step

Step	Language	Word	Meaning
1	Irish	Ó	Alternative form of ó used in surnames
2	Irish	ua	Archaic form of ó
3	Old Irish	áue	grandson
4	Primitive Irish	ᚐᚃᚔ	descendant
5	Proto-Celtic	awyos	—
6	Proto-Indo-European	h₂ewh₂yos	grandfather

Words derived from “Ó Dochartaigh”

Doherty
Docherty

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