Where does “Shalya” come from?

Shalya (English) comes from Sanskrit शल्य, from Proto-Indo-European ḱel(h₃)-.

Ancestry of “Shalya”, step by step

Step	Language	Word	Meaning
1	Sanskrit	शल्य	a dart, javelin, lance, spear, iron-headed...
2	Proto-Indo-European	ḱel(h₃)-	—

Shalya — Etymology, Origin & Word History | Etymology Explorer