Where does “olbi” come from?

olbi (Old Catalan) comes from Latin alveus, from Latin alvus, from Proto-Indo-European h₂él-.

Ancestry of “olbi”, step by step

Step	Language	Word	Meaning
1	Latin	alveus	a hollow, cavity; a hollow vessel, in the shape...
2	Latin	alvus	belly, bowels, paunch; excrement; flux,...
3	Proto-Indo-European	h₂él-	—