I think that it could be an allusion, considering that both will appeal to a
similar audience. It could also be a coincidence. It's a fairly common name.
You could say that if you look at it that way, you are in on the inside joke,
which is basically what an allusion is.
After reading your posting, I am setting American Psycho as an immediate reread for myself. It has been a while since I read the novel, but I am always curious about ties to other works. I, too, am interested if any others no the answer.
What I can say is that Bret comes off very highly educated and loves all types of art. It would not surprise me if the reference to Bonfire of the Vanities existed in the way that you suggest.
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