Where does “krǫptr” come from?

krǫptr (Old Norse) comes from Proto-Germanic kraftuz, from Proto-Germanic -þuz, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “krǫptr”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	kraftuz	strength, power
2	Proto-Germanic	-þuz	Forms result nouns from verb roots, usually from...
3	Proto-Indo-European	-tus	Derives action nouns from verb roots

krǫptr — Etymology, Origin & Word History | Etymology Explorer