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The original was posted on /r/thesimpsons by /u/Stucklikegluetomyfry on 2023-08-13 07:08:52+00:00.
Homer Jay Simpson.
Marjorie Jacqueline “Marge” Simpson (neé Bouvier)
Bartholomew JoJo “Bart” Simpson.
Lisa Marie Simpson.
Margaret Evelyn “Maggie” Simpson.
Abraham Jebediah “Abe” Simpson II.
Mona Penelope Simpson (neé Olsen)
Patricia “Patty” Maleficent Bouvier
Jacqueline Ingrid “Jackie” Bouvier
Herbert Walter “Herb” Powell
Excluding the deceased Clancy Bouvier and the one off Abby, the only core family member who hasn’t had their middle name revealed is Selma (though I guess she makes up for it with a string of last names.). I think they missed a trick by making her middle name be Anastasia and Patty’s be Drizella, since Anastasia gets a redemption arc in the straight to video Cinderella sequels and Drizella is slightly less on the nose then Maleficent.
Also not sure how canon Bart’s middle name being Jojo is. Also can’t find any references for Herb’s middle name, so I’m wondering if it’s something the Simpsons Wiki made up.
Edit: forgot Ling as well, but in my defence, so do the writers most of the time.