Trivia: "Bombur" doesn't have a single line of dialogue in the movie.
Trivia: In addition to reprising his role as Gollum, Andy Serkis served as the second unit director for the trilogy.
Trivia: The first live adaptation film of The Hobbit was made by the Soviets for Leningrad children's TV in 1985. It is on YouTube: https://youtu.be/v7Sab9LgUxg.
Answer: Hobbiton is the village where Bilbo was born. Overhill is on the northern edge of Hobbiton and Underhill is at the bottom of said hill. Built into the hill itself is Bag End, the Baggins estate. The Shire is the name of the Hobbit lands overall. So, he's from the village of Hobbiton in The Shire, and his home is Bag End, which is in the midst of the hill that forms both Overhill and Underhill.
Captain Defenestrator