Where does “Loup” come from?

Loup (French) comes from Middle French loup, from Latin Lupus, from Proto-Italic lukʷos, from Proto-Indo-European wĺ̥kʷos — wolf.

Ancestry of “Loup”, step by step

Step	Language	Word	Meaning
1	Middle French	loup	wolf
2	Latin	Lupus	—
3	Proto-Italic	lukʷos	—
4	Proto-Indo-European	wĺ̥kʷos	wolf