Where does “pleō” come from?

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

Ancestry of “pleō”, step by step

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

pleō — Etymology, Origin & Word History | Etymology Explorer