I read it first in English, with no idea who Eco was or what kind of novel it would be. Then, after a couple of years in French. Then I saw the movie. Then in Italian, then Spanish, then German. I think that in two or three years I can read it in Russian.
Meanwhile, I am sure that Umberto Eco has helped me increase my vocabulary tremendously. We might even owe the existence of this club to "The Name of the Rose." :-))