>>18907561Cöln used to be the more common way of spelling the city in german, but after the French occupation the seemingly too latin spelling got phased out for the more germanic variant with a K instead of a C. The letter C in general lost a lot of ground in the german language.
But on the other hand, a true cologner would tell you that the true spelling is Colonia and not possessing the greater Latinum means that you be basically illiterate.
