A few days old, I see. Still, I want to put in my two cents in case you're still looking. Since you can't use the terrain, use the people.

Example. Set up a naming pattern that works out to "camp of the ___ sept of the ___ clan formed by [founding person]" So maybe (don't laugh to hard) Pananacakescampoftoponymyofcartographers. Or since most people aren't Welsh and will gradually shorten it, Pananacakescamp. Unless Pananacake is a common name, in which case Pananacake'toposcamp, or for outsiders Pantoposcamp. And another is panancakestown and another is Pananacakeseat and ... you maybe get the idea.