Imported historical comment — James — 2022-05-27 20:01:34
King John was Richard's father, not his brother. It is also worth noting that the cognate of "Køben" in the Danish Copenhagen (København) in Old English is Ceappa (root of the name "Chapman") rather than Cippa, so I am not convinced of the Danish origin. Old English and Danish are both Germanic, so it could be a cognate rather than a derivative.
Original comment #1311