Where does “Forum Popilii” come from?

Forum Popilii (Latin) comes from Latin forum, from Proto-Italic *forom.

Ancestry of “Forum Popilii”, step by step

Step	Language	Word	Meaning
1	Latin	forum	public place, marketplace, forum
2	Proto-Italic	*forom	—

Forum Popilii — Etymology, Origin & Word History | Etymology Explorer