Where does “peuplier” come from?

peuplier (Middle French) comes from Old French poplier, from Latin pōpulus, from Proto-Italic poplos — army.

Ancestry of “peuplier”, step by step

Step	Language	Word	Meaning
1	Old French	poplier	—
2	Latin	pōpulus	—
3	Proto-Italic	poplos	army

peuplier — Etymology, Origin & Word History | Etymology Explorer