Step 1 : Introduction to the question "Not only do we know little of Elmyr's early life, we are not even sure of his 'real' name, as he used many aliases at different stages of his career. Which of the following did he NOT use (as far as we know)?"
...Whether from choice or by necessity, the man usually referred to as Elmyr de Hory also used many pseudonyms, possibly as many as a hundred, according to Francois Reichenbach, the producer of a film on Elmyr's career. Some of these include minor variants such as Elmyr von Houry, Baron Elmyr Hoffman and Elemér Hoffmann, as well as such distinct names as L. E. Raynal, Louis Cassou, Joseph Dory, Joseph (or Elmyr) Dory-Boutin, and Elmyr Herzog. The name 'Elmyr' is pronounced El-mere, with the stress on the second syllable.