Why won't Yahoo let me change my name (bad wording message)?

And it's nothing that's too long or inappropriate, so don't say it's either one of those reasons, I keep trying to change my name to "Purple Grape" and I keep getting this bad wording alert message. And I've tried changing my name through the info box in my pulse, through the edit preferences link in my profile, and through the comment box through a Yahoo article, and none of those ways are working. So, is this just a glitch, and has it happened to anyone else today? Thanks.