I want you to do me a favor. Think about all the people you know that use one or more initials in their name.
For instance - I go by Sean Michael Murphy - some call me Sean, Sean Michael or Murph. No initials.
Jim J. Bullock uses one initial. Michael J. Fox does the same.
A.J. Burnett uses two. I can't think of anyone that uses three.
Here's my theory. 87% (or higher) of the people you know that use an initial, have a J initial in their name.
Mathematically, your greatly increasing the odds of your child going by an initial if you give them a J name of any sort.
Now, keep in mind that I'm not saying there is an 87% chance you'll go by an inital if you have a J in your name (like this guy or this guy) I'm just saying that J's lend themselve to the ultimate abbreviation.
You do the math...