Where does “Scillus” come from?

Scillus (Latin) comes from Ancient Greek Σκιλλοῦς, from Ancient Greek σκίλλα — squill.

Ancestry of “Scillus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Σκιλλοῦς	—
2	Ancient Greek	σκίλλα	squill

Scillus — Etymology, Origin & Word History | Etymology Explorer