I asked Marc on Facebook the true etymology of *yI'De'* -- is it yI'/sir + De'/vid = cervid, or is it yI'De' = Eddie = Moose? He wrote me back:

"Hi, James! Nice to hear from you. Regarding *yI’De’* — Unfortunately, Maltz refuses to discuss these “coincidences” with me, so I won’t be able to help you. Go with whichever one makes the word easier to remember. Hope all is going well. All the best for the upcoming holidays."