Where does “*pleíhōn” come from?

*pleíhōn (Proto-Hellenic) comes from Proto-Indo-European *pléh₁yōs.

Ancestry of “*pleíhōn”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	*pléh₁yōs	—

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