You have to consider what kind of survey it was. Often, these things are done for comedy. You kick away the hundred reasonable answers and keep the five silly ones. With surveys, you've always a basic percentage of silly answers, absolutely independend from the subject you ask. I guess, you can get the same stuff by asking who is Karol Józef Wojtyła.
BTW, in Poland, is Copernikus better known under his real polish name or also the latinized form?
Harald
PS: I live not too far away from Kepler's birthplace. One of Kepler's descendants has some, er, interisting opinions his ancestor would be pretty happy about. (Imagine Johannes Kepler spinning in his grave...)
http://www.s-line.de/homepages/keppler/2frame.htm
(Follow link on your on risk)