Rules are rules. People already been banned by posting the bot names on the forum.
Lots of things are against terms of service. How strict do you want them to be? I say if it isn't affecting your gameplay, don't worry about it.
3.5 Naming Right. You may not use any name or other intellectual property belonging to Square Enix or any other third party in your use of the Game (for example, naming a character after a celebrity, company, product, or superhero).
3.5 is only refer to using SE's products names like Cloud Strife, Squall Leonheart etc etc, I think. But there's another rule refer to name and shame on the forum, dunno which one that is.