Where does “Friûl” come from?

Friûl (Friulian) comes from Latin Forum Iulii, from Latin forum, from Proto-Italic *forom.

Ancestry of “Friûl”, step by step

Step	Language	Word	Meaning
1	Latin	Forum Iulii	Julius' forum
2	Latin	forum	public place, marketplace, forum
3	Proto-Italic	*forom	—