Does Bart and Lisa have a middle name?

bart's middle name isn't jay, that's the middle name of homer, we can see it in an episode where homer is looking for some information about his past, and he goes to a type of farm where there is a mural with his name.

Actually, I can't remember which episode it was but Homer once yelled BARTHOLOMEW J SIMPSON

Bart's middle INITIAL is J. His middle NAME is Jojo. Jojo starts with J.