This is a crucial insight into his psychology. He views himself as a collection of failing biological parts rather than a whole human being. By calling himself "Jack," he is distancing himself from his own pain. He isn't a person feeling pain; he is just a spleen that ruptured. He is an observer in his own body.
So, what is the Narrator's name?
Let’s break down why this nameless protagonist is the key to the entire movie. narrator name fight club