Where does “repo” come from?

repo (Latin) comes from Proto-Italic rēpō, from Proto-Indo-European h₁reh₁p- — to creep.

Ancestry of “repo”, step by step

Step	Language	Word	Meaning
1	Proto-Italic	rēpō	—
2	Proto-Indo-European	h₁reh₁p-	to creep

repo — Etymology, Origin & Word History | Etymology Explorer