Clarence

Meg: You remember me? Because I sure remember you, Clarence. – , 6.10 Caged Heat

"Clarence" is a nickname for Castiel frequently used by the demon Meg. First in the episode 5.10 Abandon All Hope.

The name is a a reference to the movie It's A Wonderful Life, in which the angel Clarence shows Jimmy Stewart that life is worth living, and then finally gets his wings and goes to heaven.