 J is Matt Groening (qv)s favorite middle initial in tribute to  Jay Ward (I) (qv), creator of Rocky and Bullwinkle (Bullwinkle J.  Moose) and other classics; hence the J in Philip J. Fry, Hubert J.  Farnsworth, Cubert J. Farnsworth, Homer J. Simpson, Abraham J.  Simpson, and Bart J. Simpson.