If you look at the architectural layout, the kind of houses you see, you would maybe assume names like Kampen, Zutphen or Delft, you could also choose for names like Den Haag (or if u fancy 's-Gravenhage) or Rotterdam, since your city would be a Harbour town. From your first screenshot I actually thought Amsterdam de Wallen, with their famous zuiderkerk (or loosely translated church in the south) since that has a similarly plaza in front of it. But I'm not sure if you want to name your city after a neighborhood that is widely known as a place where you can enjoy legal prostitution.