I've had this happen with the filter before with someone that had a ton of 7's in their name. I couldnt add them to anything because it told me to stop being spammy. Other than changing their name, there really isn't anything to get around it because of the chat filter.
Yes, this is an unfortunate problem. Same with the a r i... Wea r i ng a piece of armour is a problem, so I guess gotta go weng!
There is not much we can do. I'll talk to Cypriot about our chat filters. Sorry for the inconvenience! Report handled.