I recall a snippet on CoasterGallery bringing it up once. The name of the first park, Six Flags Over Texas was originally meant to be "Texas under six flags", with an area themed to each of the six nations who have been in control of the state. But the owner purportedly changed his mind, figuring out that Texas shouldn't really be "under" anything. So the perspective was changed, so to say, to Six Flags over Texas, which invokes the image of flags flying gloriously in the breeze, instead of Texas being thrown between rulers like a trade commodity.