Where does “скоба” come from?

скоба (Old Church Slavonic) comes from Proto-Slavic skoba, from Portuguese escovar, from Latin scōpāre, from Latin scōpa, from Proto-Italic *skōpā.

Ancestry of “скоба”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	skoba	bracket
2	Portuguese	escovar	—
3	Latin	scōpāre	—
4	Latin	scōpa	—
5	Proto-Italic	*skōpā	—

скоба — Etymology, Origin & Word History | Etymology Explorer