CASTIEL IN EVERY EPISODE: 4x07; It’s the Great Pumpkin, Sam Winchester
New scans - HARPER’S BAZAAR MAGAZINE [x]
9 seasons, 195 episodes, 80 hugs, and thousands of tears later … it all began, September 13, 2005, with two brothers.
Castiel’s vessel’s name is Jimmy ‘Novak’. Since Castiel doesn’t have a last name, they use Jimmy’s instead.
Anna ‘Milton’ was the fallen angel (Anael) and superior of Castiel before she fell. The angels refer to themselves as brothers and sisters so sometimes writers will use the surname of Anna.
That’s how I make sense of it anyways. If someone else thinks otherwise then feel free to add your two cents.