But how does sharing the name 'Tyler Durden' work?

Rating: 8/10 (20 December 2004)

Yes I liked the film but I'm just wondering how Norton gives his alter ego the same name as him and can successfully convince himself they are two separate people when they share the same name. i.e. growing up being called Tyler Durden, being called Tyler at work, etc... how does the separation of the narrator's character and his name, Tyler D., work? Maybe a literate somebody who was confused like me can show me the light. Thanks, because I am confused.
Besides that...because the IMDb guidelines say I have to have 10 lines of text to make my post legit...who else watched the Norton, Pitt, Bonham and Fincher commentary? I did. It was jokes, and at the same time insightful. Anybody share my feelings? Raise your hand.