Where does “cūstos” come from?

cūstos (Latin) comes from Proto-Indo-European (s)kewH- — to cover, bedeck; cover.

Ancestry of “cūstos”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)kewH-	to cover, bedeck; cover

cūstos — Etymology, Origin & Word History | Etymology Explorer