Where does “eldhúshnífur” come from?

eldhúshnífur (Icelandic) comes from Icelandic eldhús, from Icelandic eldur, from Old Norse eldr, from Proto-Germanic ailidaz, from Proto-Germanic ailijaną, from Proto-Indo-European h₂eydʰ- — to ignite; fire.

eldhúshnífur (Icelandic): kitchen knife

Definitions

kitchen knife

Ancestry of “eldhúshnífur”, step by step

eldhúshnífur traces back through two separate lines of ancestry.

via Icelandic eldhús

Step	Language	Word	Meaning
1	Icelandic	eldhús	kitchen
2	Icelandic	eldur	fire
3	Old Norse	eldr	fire
4	Proto-Germanic	ailidaz	fire, pyre
5	Proto-Germanic	ailijaną	to kindle
6	Proto-Indo-European	h₂eydʰ-	to ignite; fire

via Icelandic hnífur

Step	Language	Word	Meaning
1	Icelandic	hnífur	knife
2	Icelandic	knífur	knife
3	Old Norse	knífr	knife
4	Proto-Germanic	knībaz	pincers; shears; knife
5	Proto-Germanic	knīpaną	to pinch
6	Proto-Indo-European	ǵneybʰ-	—

Every word from Proto-Indo-European h₂eydʰ- →Every word from Proto-Germanic ailijaną →Every word from Proto-Germanic ailidaz →