Tramennis of Jetstone, designated heir in the midst of the Siege of Spacerock (Book 2 Page 95) and was last seen having strong words with Charlie about the events of that day. (Book 2 Epilogue 24)
Lilith the Archon was captured by Jetstone during the Siege, and was last seen being guarded by Pierce. (Book 2 Epilogue 11)
Lunesta, Unisom, and Ambien are sleep medications.
Dairious likely derives from dairy (as he ruled Cheeseburg) and references a warm glass of milk before bed (believed to help you fall asleep).
Alvin, Simon and Theodore are the Chipmunks.
Corian, Meganite, Swanstone and Jetstone are all types/brands of tiling.