Where does “nykel” come from?

nykel (Norwegian Nynorsk) comes from Middle Norwegian nykill, from Old Norse lykill, from Old Norse lúka, from Proto-Germanic lūkaną, from Proto-Indo-European lewǵ- — to break, tear; to break, shatter.

nykel (Norwegian Nynorsk): key

Definitions

Ancestry of “nykel”, step by step

Step	Language	Word	Meaning
1	Middle Norwegian	nykill	key
2	Old Norse	lykill	key
3	Old Norse	lúka	to shut; to end, bring to an end, finish,...
4	Proto-Germanic	lūkaną	to close, to shut; Alternative form of *leukaną
5	Proto-Indo-European	lewǵ-	to break, tear; to break, shatter

Every word from Proto-Indo-European lewǵ- →Every word from Proto-Germanic lūkaną →Every word from Old Norse lúka →