Where does “*ẹk(k)iŕ” come from?

*ẹk(k)iŕ (Proto-Turkic) comes from Proto-Turkic ẹk(k)i — two.

Ancestry of “*ẹk(k)iŕ”, step by step

Step	Language	Word	Meaning
1	Proto-Turkic	ẹk(k)i	two