I was surprised to discover that our next-door neighbors had no idea who "Yoda" was, which was startling. I mean, I like to think I have a pretty good sense of perspective where such things are concerned. I don't expect non-fannish types to know who "Aeryn Sun" or "Odo" or "Zatanna" are, but Yoda? He's on lunchboxes, paper plates, and greeting cards for Obi-Wan's sake! I thought Yoda was mainstream.
Then again, my girlfriend's mom had no idea who "Mr. Spock" was, even after I showed her a photo of Nimoy with the ears. And my mom thought that "Smallville" was a show about little people. (Really!)
(On the other side of the coin, I recently got into a discussion of Doc Savage with the receptionist at the vet's office. That startled me, too!)