I initially commented to the above effect that it was just a random brain-bleep and I did not remember your True Name if indeed I had ever been told it, but then deleted the comment, since if I had known your name to be Allison and genuinely slipped up, I would want to be the sort of person who simply wouldn't say whether or not it was a revealing slip-up, one way or the other, so as to maintain Plausible Deniability. To put it another way, if it had been your real name, I would want to be able to truthfully say, "Whether it was her real name or just a brain-cache substitution, I would not confirm or deny it one way or the other, so you cannot take any evidence from the fact that I am being apparently evasive." This requires that I say the same thing whether your name is Allison or not, since otherwise people can take Bayesian evidence from it. However since in this case you have already commented to this effect, I suppose I might as well confirm it.

I did once know an Allison and my brain seems to repeatedly substitute that name for yours. I usually catch it before commenting, but not this time. There are other bizarre things my brain does along the same lines, for example, I simply cannot remember, even after having been told a dozen times or more, whether Peter Thiel's last name is pronounced Thee-el or Tee-el.