Where does “-гӣ” come from?

-гӣ (Tajik) comes from Persian ـگی, from Old Anatolian Turkish ـکو, from Proto-Turkic *-gü.

Ancestry of “-гӣ”, step by step

Step	Language	Word	Meaning
1	Persian	ـگی	—
2	Old Anatolian Turkish	ـکو	—
3	Proto-Turkic	*-gü	—

-гӣ — Etymology, Origin & Word History | Etymology Explorer