Where does “Griogair” come from?

Griogair (Scottish Gaelic) comes from Old Irish Grigoir, from Latin Grēgorius, from Ancient Greek Γρηγόριος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Griogair”, step by step

Step	Language	Word	Meaning
1	Old Irish	Grigoir	—
2	Latin	Grēgorius	—
3	Ancient Greek	Γρηγόριος	watchful, vigilant
4	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
5	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Words derived from “Griogair”

MacGriogair
Macgregor

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Γρηγόριος →