Where does “grego” come from?

grego (Galician) comes from Old Portuguese grego, from Latin Graecus, from Ancient Greek Γραικός, from Ancient Greek γραῖα, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

grego (Galician): Greek; Greek person; Greek language

Definitions

Greek; Greek person; Greek language

Ancestry of “grego”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	grego	—
2	Latin	Graecus	Greek, Grecian, of or pertaining to the Greek...
3	Ancient Greek	Γραικός	Greek; a Graecian, a member of an ancient...
4	Ancient Greek	γραῖα	Graea, Boeotia; Greece
5	Proto-Indo-European	ǵerh₂-	to grow old, to mature

Every word from Proto-Indo-European ǵerh₂- →Every word from Ancient Greek γραῖα →Every word from Ancient Greek Γραικός →