Where does “skarpsill” come from?

skarpsill (Swedish) comes from Swedish skärp, from Old Swedish skarper, from Old Norse skarpr, from Proto-Germanic skarpaz, from Proto-Indo-European (s)kerb-, from Proto-Indo-European sḱer- — to caw, crow.

skarpsill (Swedish): European sprat, Sprattus sprattus

Definitions

European sprat, Sprattus sprattus

Ancestry of “skarpsill”, step by step

skarpsill traces back through two separate lines of ancestry.

via Swedish skärp

Step	Language	Word	Meaning
1	Swedish	skärp	belt; sash
2	Old Swedish	skarper	dry, shrivelled; sharp; shrill, piercing
3	Old Norse	skarpr	sharp
4	Proto-Germanic	skarpaz	rough
5	Proto-Indo-European	(s)kerb-	rough, sharp
6	Proto-Indo-European	sḱer-	to caw, crow

via Swedish sill

Step	Language	Word	Meaning
1	Swedish	sill	a herring
2	Old Norse	síld	herring
3	Proto-Germanic	sīlą	a kind of fish; a launce, sand eel; a herring

Every word from Proto-Indo-European sḱer- →Every word from Proto-Indo-European (s)kerb- →Every word from Proto-Germanic skarpaz →