What is the name of the bubble boy from Seinfeld?

Here is a script quote:

MEL: It's a fine product. Anyway, I saw you on the Tonight Show a couple of weeks ago. I was watching the show with my son, Donald. He's got this rare immune deficiency in his blood. Damnedest thing. Doctors say he has to live in a plastic bubble. Can you imagine that? A bubble.

Mel (the Bubble Boy's dad) and John Hayman (As the Bubble Boy)

www.angelfire.com/sc/seinscripts/bubble.html

I am a major 'Seinfeld' fan. The bubble boy's name is Donald.

For those who are just dying to know. His last name is Sanger.

The bubble boy's name was Donald played by Jon Hayman in episode 47, air date Oct. 7 /92. He was also in the final episode.

http://wso.williams.edu/~jmackay/Seinfeld4.html