Donald Trump used the pseudonym ‘John Barron’ throughout the ’80s
https://www.cnbc.com/video/2020/11/04/donald-trump-used-the-pseudonym-john-barron-throughout-the-80s.html
Why Are So Many Film and TV Characters Named Jack or John?
https://the-take.com/watch/why-are-so-many-film-and-tv-characters-named-jack-or-john