Calling it "Klyros City" etc is generally OOC, unless your character can't remember the name of the city he's never had the chance to visit. In which case, yeah, it's a quick easy description.
If I was a Frenchman living in the medieval era, having moved from one side of France, say, to another, hence not knowing the region well, and I was now on the border of France and Spain, I would say "I'm going to the Spanish city to sell some of my wares." if I couldn't remember the name of said city.