Where does “luēs” come from?

luēs (Latin) comes from Latin luō, from Proto-Indo-European lewh₃- — to wash.

Ancestry of “luēs”, step by step

Step	Language	Word	Meaning
1	Latin	luō	—
2	Proto-Indo-European	lewh₃-	to wash

luēs — Etymology, Origin & Word History | Etymology Explorer