[mikelevins]

Just a nit: the film "The Invisible Man" is unrelated, based on a novel by H. G. Wells about a scientist who drives himself mad with a technique that renders him invisible.

Ralph was named for Ralph Ellison, author of a different, later book Invisible Man, about being a black man in America.

[thisisnot]

You are right, wikipedia: According to Apple Confidential by Owen W. Linzmayer, the original code name for the Dylan project was Ralph, for Ralph Ellison, author of the novel Invisible Man, to reflect its status as a secret research project.