I was really thinking of the greats of the game, such as Greenberg and Koufax. Of course, Koufax did play for Brooklyn in his early years, before moving with the Dodgers to L.A. He didn’t do much playing though, spending most of the time on the bench as a pitcher who was too wild to pitch regularly.
There was also Art Shamsky who played for the NY Mets in the late 60’s and early 70’s.
Currently, Kevin Youkilis who plays for the Boston Red Sox is Jewish. He was recently voted “Jewish Player of the Decade.”
His family name was changed from Weiner several generations ago. He started his career in the Jewish Community Center fast-pitch softball league.
The Baseball Prospectus player page of Youkilis accidentally named his page “You Kike.” They named pages like this: take the first five letters of the player’s last name and the first two letters of his first name to create the unique URL for information on the player. In this case, the URL for Youkilis spells “Youkike.”
In 2006 the Red Sox had three Jewish players on their roster at the same time, Youk, Gabe Kapler and Adam Stern.