Gee Rock, I didn't know that. Thanks for the info. I Googled Koln and found this.
Is Koln Germany the same as cologne?
"Agrippina" was later dropped (except in Latin), and "Colonia" became the name of the city in its own right, which developed into modern German as Köln. "Cologne", the French version of the city's name, has become standard in English as well.
Here's an interesting historical account from Roman times forward.
https://en.wikipedia.org/wiki/History_of_Cologne