One thing Narnia did not have is a lot of human towns. In fact, I can think of only two: the Telmarine settlements of Beruna and Beaversdam. There’s also a town called Chippingford in The Last Battle but whether it is human or not is unclear. There’s also some kind of human settlement around Cair Paravel to support both it and the shipping trade of the port, but it goes nameless. Unlike the vast majority of fantasy worlds, Narnia is bereft of human habitations, at least in the stories Lewis chose to write.
If there were towns and other human-named features, however, here’s how they might have been named.
Places in Narnia
The Lord’s Skyway
The Giant’s Pace