Where does “København” come from?

København (Norwegian Bokmål) comes from Danish København, from Old Danish Køpmannæhafn, from Old Danish hafn, from Old Norse hǫfn, from Proto-Germanic habnō, from Proto-Indo-European kopno-.

Ancestry of “København”, step by step

Step	Language	Word	Meaning
1	Danish	København	Copenhagen
2	Old Danish	Køpmannæhafn	Copenhagen
3	Old Danish	hafn	harbour, port
4	Old Norse	hǫfn	port, harbor, haven
5	Proto-Germanic	habnō	harbour, haven; harvour, haven
6	Proto-Indo-European	kopno-	—

Every word from Proto-Indo-European kopno- →Every word from Proto-Germanic habnō →Every word from Old Norse hǫfn →