Where does “Köln” come from?
Köln (Icelandic) comes from German Köln, from Latin colōnia, from Latin colōnus, from Latin colō, from Latin quelō, from Proto-Italic kʷelō, from Proto-Indo-European kʷéleti, from Proto-Indo-European kʷel- — to turn.
Ancestry of “Köln”, step by step