Where does “*ešče” come from?

*ešče (Proto-Slavic) comes from Proto-Indo-European *h₁esk(ʷ)e(h₁).

Ancestry of “*ešče”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	*h₁esk(ʷ)e(h₁)	—

*ešče — Etymology, Origin & Word History | Etymology Explorer