I can tell you about my experience, because - due to privacy issue - I had my Display Name changed.Never met any side effects. My new display name is working properly on every possible game list - so there's no rule, but probably it's a bit risky. .As Inculpatus said, I'd recommend you to submit another ticket and ask for more details.The GM I spoke to was very helpful. The whole operation took 4 days from my first message. Wish you luck with your name :)