I tried to sign up for the Airmiles Reward Miles program at www.airmiles.ca yesterday, but could not complete the registration process due to an error. The error read, "There are illegal words in your input text", as per the attached picture. At first, I thought that perhaps the system had a problem with the punctuation in the name of my city, St. John's (as I have had issues with this on other sites before), but after removing the period and the apostrophe, I was still unable to register. Then it hit me. My surname is Butt.
I Googled "funny surnames", just to see whether there were other "illegal" names out there. Oddly enough, I was able to continue without error by using the last names Balls, Death, and Cockshott (all real surnames according to http://www.nationalpost.com/related/topics/story.html?id=1428506)
No "illegal words" error when I tried to sign up as "Janet Nipples", either.
I contacted them via their feedback link and they contacted me today, saying that I could email my information to them for processing. I asked if they might fix this problem and got a reply with their generic message saying they would "forward my concerns to the appropriate department".