Origin of the name "Bag End" I was looking up some etymologies today when I stumbled upon this gem!

The expression "cul-de-sac" originated in England during the period when French was spoken by the English aristocracy. In French, Catalan or in Occitan, "cul-de-sac" literally means "ass of a bag." Tolkien used the name Bag End as a literal translation of "cul-de-sac," to poke fun at the British use of French terms.

Don't know if this is common knowledge, but as a word-nerd and LOTR fan, I found it pretty neat.