This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
Jo-jo (according to Nancy Cartwright--who voices Bart), Jay (according
to [AABF02]), and nothing, respectively. The J is in honor of
Rocky&Bullwinkle, who had the J initial, in honor of their creator, Jay
Ward.
 
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