It sounds very much like "Dawson" to me, and I've never seen a name spelled Dorcen. On the other hand, when I watched The Sideshow I thought La La Parlour was "La La Pa La" until I saw it in the credits. As for "Langbein," I spelled it that way because that seems to be the most common spelling.

they ALWAYS switch around the fake middle names for the other two

I cherish the hope that Richard's middle name actually is Cynthia.