Yes, we need the unique “official” name for each character, which is more than just a single word.
I think the complex formatting options, as suggested by @Xetem is a bit too technical. Works for me. But I want it to work for everyone 
This is probably what I would prefer as well. And as default, the first name would be used.
However, that still leaves the question: How to handle [Feature] Duplicate first names in a room?