Back in the day, people got their last names based on their profession.

Karl Marx was actually born without a last name. He was a bastard and didn't know his real parents.

Throughout his life he changed his last name a couple of times, but when the end was nearing, and he reflected on his life, he changed it one last (haha) time: from ThatCommunisWithTheBeard to Marx. And was quoted saying "lol what did I think going with this long last name. gonna cost a ton to write it on the gravestone. Also I'm a Marxist so it kinda make sense, right? right? is anybody here??"

But no one was there, when he took his last breathe, except for me of course. But that's a story for another time...