I don't believe any middle name was stated in the series. Joanne is the comic book Lois' middle name, which is why the fandom picked up on it.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited