Where does “ربي” come from?

ربي (Moroccan Arabic) comes from Arabic رب, from Proto-Semitic rabb- — to expand, to extend; lord, owner, chief;...

Ancestry of “ربي”, step by step

Step	Language	Word	Meaning
1	Arabic	رب	to be master, to be lord; to have possession, to...
2	Proto-Semitic	rabb-	to expand, to extend; lord, owner, chief;...