There is no connection between Cayce and Case; no meaningfulness. Gibson explains that as part of his novelist craft, he goes through a complicated artistic ritual in order to summon his characters out of the ether. In this ritual, coming up with the right name is the crucial first step. And the process by which he came up with Cayce, he declares, had nothing to do with Case. "Cayce" was its own "found object" -- much as the name Case, from "Neuromancer," was also a found object, inspired originally by Case pocketknives.