In the appendices to Dune, Frank Herbert refers to a book by Pander Oulson, a transparent anagram of Poul Anderson. How many other characters, major, minor, or single appearance, are fictionalizations of real people, whether tuckerized, roman à clef, or other disguise?
There is at least one other deliberate anagramatisation in the Dune novels;
"For a more detailed study [of Krimskell Fiber] see Holjance Vohnbrook's 'The Strangler Vines of Ecaz' "
Holjance Vohnbrook is an anagram of John Holbrook Vance, the real name of Jack Vance, a contemporary of Frank Herbert on the scifi book circuit.