How do you get a middle initial of J if your middle name is Andrew?

It's really not Marty McFly I'm talking about today, it's Michael J Fox.  Michael was born born Michael Andrew Fox; June 9, 1961, in Canada, where he began his acting career as a teenager.  He was discovered by producer Ronald Shedlo and made his American television debut in the television film Letters from Frank, credited under the name "Michael Fox".   As the story goes, he intended to continue to use the name, but when he registered with the Screen Actors Guild, which requires unique registration names to avoid credit ambiguities, he discovered that Michael Fox, a veteran character actor, was already registered under the name.  As he explained in his autobiography, Lucky Man: A Memoir, and in interviews, he needed to come up with a different name. He did not like the sound of "Andrew" or "Andy" Fox, so he decided to adopt a new middle initial and settled on "J", and thus, he's Michael J. Fox, as we now know him.

That's as far as I intended to go with this version of "As the story goes...", but during my research, I found out a lot more about the actor I knew growing up... I loved him best as Marty McFly.  Michael was diagnosed with Parkinson's Disease in 1991, but hid it until 1999 when the symptoms could no longer be hidden by drugs or acting.  Michael testified before the Senate Appropriations Subcommittee in 1999 seeking a mere 75 million dollars to be to be used for Parkinson's research in an attempt to find a cure.  Here's a link to his testimony:

 http://www.c-spanvideo.org/clip/4271310

I look forward to writing someday, and "As the story goes, that's where it began and how we found a cure for Parkinson's.