The spelling "Google" predates "Googol", and influenced it.
http://en.wikipedia.org/wiki/Barney_Google_and_Snuffy_Smith#...
http://en.wikipedia.org/wiki/Barney_Google_and_Snuffy_Smith#...
It's not going to stop me from pronouncing the search engine name as "goo-glee" since it still appears in my mind as a misspelling of googol.