Where does “Ῥώσκιος” come from?

Ῥώσκιος (Ancient Greek) comes from Latin Roscius, from Latin rōscidus, from Latin -idus, from Proto-Italic *-iðos.

Ancestry of “Ῥώσκιος”, step by step

Step	Language	Word	Meaning
1	Latin	Roscius	—
2	Latin	rōscidus	—
3	Latin	-idus	tending to
4	Proto-Italic	*-iðos	—

Ῥώσκιος — Etymology, Origin & Word History | Etymology Explorer