Where does “Kopenhago” come from?

Kopenhago (Esperanto) 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 “Kopenhago”, step by step

StepLanguageWordMeaning
1DanishKøbenhavnCopenhagen
2Old DanishKøpmannæhafnCopenhagen
3Old Danishhafnharbour, port
4Old Norsehǫfnport, harbor, haven
5Proto-Germanichabnōharbour, haven; harvour, haven
6Proto-Indo-Europeankopno-—
Every word from Proto-Indo-European kopno- →Every word from Proto-Germanic habnō →Every word from Old Norse hǫfn →