Where does “O'Dea” come from?

O'Dea (English) comes from Irish Ó Deághaidh, from Irish Deághadh, from Scottish Gaelic deagh, from Old Irish deg-, from Old Irish dí, from Proto-Celtic dī, from Proto-Indo-European de — Emphatic or contrastive particle, and, but;...

Ancestry of “O'Dea”, step by step

Step	Language	Word	Meaning
1	Irish	Ó Deághaidh	—
2	Irish	Deághadh	—
3	Scottish Gaelic	deagh	good, excellent, worthy
4	Old Irish	deg-	—
5	Old Irish	dí	third-person singular feminine of di: from her;...
6	Proto-Celtic	dī	from
7	Proto-Indo-European	de	Emphatic or contrastive particle, and, but;...

Every word from Proto-Indo-European de →Every word from Proto-Celtic dī →Every word from Old Irish dí →