Gary Gygax interview 2001
kp: What is the correct pronunciation of Gygax (is it guy-gacks or jai-gacks)?
gg: Auf (Switzer) Deutsche, it is "Ghe-gox." Many of the family use that pronounciation. My part of the family has Americanized to be pronounced "Guy-gacks."
kp: Do you have 20-sided dice hanging from your rear-view mirror?
gg: No, nor do I own an auto...
the rest...
http://www.kittenpants.org/11_Loneliest/gygax.asp