"Internet nexus of cultural Judaism" — Examiner.com
The other famous person I know of with a single letter as a middle name is former President Harry S Truman (not Jewish of course)
Harry S. Truman... "His middle initial 'S' honors his grandfathers, Anderson Shipp Truman and Solomon Young". (Wikipedia). President Truman was a steadfast friend of Israel and he said that one of the proudest moments in his life occured when he was able to recognize the new Jewish state in May 1948.