  I was listening to them talk, and whats your last name?"  "Wilkerson, why?" Malcolm replied. "Oh. Who are the Pariahs?" said  the other kid. The joke was eventually cut, and the shows writers  subsequently decided never to reveal the familys last name, but it  would seem they forgot about Franciss name tag. In the company  picnic episode, Hal also refers to them as the Wilkersons.