Interesting how the Coens conflate Phil Ochs with Van Ronk in the form of Llewyn Davis. His friends are Jim and Jean (perhaps the only names in the film that go unchanged), and he has a sister who lives a long subway ride away in one of the outer boroughs of NYC.

Jim Glover was Phil's roommate at Ohio State, I believe.

Phil's sister was named Sunny. She lived in Far Rockaway (Brooklyn). Llewyn's is named Joy. I don't recognize her street from the movie, but someone will.