Board Thread:The Panopticon/@comment-7302713-20130519181606/@comment-78.8.7.189-20130521122635

I'd say that for navboxes one or two-word common name should be enough. It's usually first name (Susan, Tegan), sometimes last name (Turlough, Benton, Wibbsey) can be two names (Sarah Jane) or a title (Brigadier). In most cases, it's pretty clear.