Originally Posted by Buzzfloyd

The Jonathan/Noel question has been addressed, in that Pterry's said, "Ah yes, one refers to him as Jonathan, and one as Noel." I think the answer was that he was Jonathan but has been referred to as Noel due to the events in Hogfather, and people have now largely forgotten his real first name.

For a lot of Assassin names, check Pyramids and Nightwatch.