Who is William? Is there someone called William in the TV series of the Walking Dead whom we are unaware of? His name is mentioned here in the TV episode: Days Gone Bye (the pilot episode in the 1st Season).

Rick, after taken care of his wounds by Morgan, he gets ups and takes a dinner with Morgan and his son, Duane. After their dinner, they are in their beds. Before they go sleep, they have the following conversation/dialog:

-Morgan: Carl... He your son?

-Morgan: William. He said his name today...

-Rick: He's a little younger... than your boy.

-Morgan: And he's with his mother?

I don't get it. Who's William? And how Willam knows Carl's name? Where is William? Someone intended to be in the episode but was cut off?