Where does “Rocío” come from?

Rocío (Spanish) comes from Spanish rocío, from Old Spanish rucio, from Vulgar Latin roscidare, from Latin rōscidus, from Latin -idus, from Proto-Italic *-iðos.

Rocío (Spanish): dew

Definitions

Ancestry of “Rocío”, step by step

Step	Language	Word	Meaning
1	Spanish	rocío	dew; sprinkle, shower; quaff, chug
2	Old Spanish	rucio	dew
3	Vulgar Latin	roscidare	—
4	Latin	rōscidus	dewy
5	Latin	-idus	tending to
6	Proto-Italic	*-iðos	—

Every word from Proto-Italic *-iðos →Every word from Latin -idus →Every word from Latin rōscidus →