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And Warrenton, Springfield, and Annandale are all towns with separate local governments, and you don't want to get sued. So you ask the respective governments if you can use their town's name in an upcoming game that takes place in the area, and some of them say "No," hence a similar sounding name around the same location.
Sorry, don't mean to berate you, but that theory is complete and utter nonsense. A town doesn't have a copyright to its name.
Sure, anybody can sue anybody for anything, but that doesn't mean that they will get anywhere.
And if there was any validity to the theory, don't you think using a similar sounding name would present a similar problem?
No, the reason the names are changed is quote "realistic". As Belanos said, words, including place-names, have a way of changing over time.