Nobody knows what the "J" stands for. And there's no way of finding out. It shall forever remain a mystery. WE SAID IT SHALL REMAIN A MYSTERY.
Sure, one could easily go to the J Ludlow website and solve the riddle in a matter of minutes. But then WE would have to come up with a carefully crafted writeup containing research and dialogue.
INSTEAD: A list of things the J might stand for:
Jim Morrison Ludlow