It's pretty common knowledge where the word hamburger comes from. It's named after Hamburg, a city in northern Germany. This is similar to how Frankfurters were named after Frankfurt and wieners were named after Vienna; in this case, the term was applied because Germans from the area brought their style of soft seasoned meat to America, where it became known as Hamburg meat for a while until Charlie Nagreen used that to make the first real hamburger in 1885. That's fascinating, but what's most interesting to me is the subsequent rebracketing: so many people thought that hamburger included the prefix ham-, because both words included some kind of meat, so they abbreviated it to burger, a term that really shouldn't exist given the origin.
Adam Aleksic, a rising sophomore studying linguistics and government at Harvard University, has been described as the internet's sixth most famous etymologist. He also has disturbing interests in politics, vexillology, geography, board games, conlanging, and law.