Clown and mime get to have cool custom names, why can’t the chaplain? The chaplain typically RP’s quite a lot and having the option would enhance it so long as it is policed a bit more than clown/mime.
Right now if you want to RP as the Dalai Lama? Fuck you pound rocks, that’s a title not a name and you can’t have that. Literally 1984 by George Orwell.
What if I want to do a Catholic gimmick? Well I can’t be Pope Urbanus MLXXVIII, and who the hell is taking you seriously as space-pope if your name is just John Smith.
Sure you might have to deal with a couple pin-heads naming themselves Jesus H. Christ and being a dumbass but I think the benefits outweigh the negatives.