Because of some long-ago experimentation with the form of my own name as an author credit, I have always been fascinated by people who drop given names or reduce them to leading initials. I’ve started keeping a list of those I know and have found over the years - toss in your candidates.
NOT to be included are people who adopt stage or pen names wholly unlike their birth names, people who drop, initial or modify middle or last names, or (for the most part) the vast number of British notables of the 20th century who followed the custom of using two initials for their publication names. Thus, I wouldn’t be interested in Marion Morrison (John Wayne), Willa Seibert Cather, or A.E. Housman.
But Thomas Woodrow Wilson, J. Edgar Hoover, Walter Bruce Willis, John Pierpont Morgan and Edward Aleister Crowley? You bet. Gimme all you got.
I know this is not quite what you asked for, but it’s so odd I just can’t resist it.
English actor drops his two last given names (Hoar Stevens), then takes his second given name, appends a hyphen, then his first given name and becomes the quintessential cad…