I agree. I wouldn't object to it if the Ruler in question (Arrakis in this case) can hold on the throne for a bit and there's some sort of general acceptance within the Realm to change the name (To avoid a powerplay that is going to be turned over immediately). I'd have the same opinion on Realm Government Type though, especially as you can set the Elections to mimic any system anyway (It shouldn't be easy, but it should be possible beyond setting up Rebellions or Secessions). I'm not sure if others agree with that, and I believe Realm Names fall in the same area of change. If it's not too much effort, I'd say such changes would be accompanied with quite some confusion amongst the peasants and unrest.
