Where does “pleo” come from?

pleo (Latin) comes from Proto-Italic plēō, from Proto-Indo-European pleh₁- — to fill.

Ancestry of “pleo”, step by step

Step	Language	Word	Meaning
1	Proto-Italic	plēō	to fill
2	Proto-Indo-European	pleh₁-	to fill

pleo — Etymology, Origin & Word History | Etymology Explorer