That's still wrong. Nobody knows who Stefani Joanne Angelina Germanotta is other than her mother, and Lady Gaga is the name her famous so that is appropriate, as is Madonna's since virtually no one would know her by her real name. However, in the case of real people and not stagenames, it seems inappropriate, certainly illiterate and uneducated to title an article by his nickname, especially when he is not generally known by that name. It is the same thing for New York U.S. Senator, "Chuck Schumer" which is purely his advertising name, promoted by his marketing staff, since his name that he was known entirely by for most of his political career, and until very recently, was "Charles". However, to humanize him, as "Jim" Inhofe's staff has done with him for marketing purposes, rather than James for which the other 49 states and the international population know him as, is both misleading and essentially promoting informalism as an accepted format for an encyclopaedia. And informalism ought to be attributed to poor scholarship and simple, less educated work - not an excuse for poor workmanship...