Cas: Dean did not bestow a name upon his feline. I suppose he doesn’t wish to become attached.

Dean: Oh, I have a “name” for it. 

Cas: However I have named mine Bobby after our departed friend. 

Dean: …

Sam: … Jess.  

Dean: … Dammit guys! His name is… it’s… *sighs* John. He looks like a John… We’ll call him Jo for short.