Where does “síl” come from?

síl (Old Norse) comes from Proto-Germanic sīlą — a kind of fish; a launce, sand eel; a herring.

síl (Old Norse): herring

Definitions

Step	Language	Word	Meaning
1	Proto-Germanic	sīlą	a kind of fish; a launce, sand eel; a herring

síl — Etymology, Origin & Word History | Etymology Explorer