Every year there are players not in the MLB Players Association that are masked with fake names. Most prospects are already in the game under such fake names. They usually have the same initials, but more importantly their age, height, weight, and bat/throw arms should match up with their real life counterpart.
There are exceptions to the initials rule, which occasionally makes it difficult to figure out who a player is. One player in the FA pool who stands out is "Lee Choo". Lee Choo = Kenji Johjima, the former Mariner catcher that went back to Japan (you can even see that his birth country is Japan when you edit him).
Can you guys come up with any? Post them here and let's get as complete a list as we can.