Where does “elkos” come from?

elkos (Proto-Italic) comes from Proto-Indo-European h₁élḱos, from Proto-Indo-European h₁elḱ-.

Ancestry of “elkos”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	h₁élḱos	wound, illness, ulcer; wound, sore, ulcer
2	Proto-Indo-European	h₁elḱ-	—

elkos — Etymology, Origin & Word History | Etymology Explorer