Where does “Ἀνταλκίδας” come from?

Ἀνταλκίδας (Ancient Greek) comes from Ancient Greek ἀλκή, from Proto-Indo-European h₂lek- — to protect.

Ancestry of “Ἀνταλκίδας”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἀλκή	prowess, force; defense, guard; battle, fight
2	Proto-Indo-European	h₂lek-	to protect