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5 Answers
Eugene Gray
Eugene Gray, worked at Google (2014-2016)
Mark L. Levinson
Mark L. Levinson, writer/editor/translator
Brin's father Michael brought the family to the USA from the Soviet Union because of open anti-Semitic discrimination there. Moment magazine says:

"The Brins were no different from their fellow immigrants in that being Jewish was an ethnic, not a religious experience. 'We felt our Jewishness in different ways, not by keeping kosher or going to synagogue. It is genetic,' explains Michael. 'We were not very religious. My wife doesn’t eat on Yom Kippur; I do.' Genia interjects: 'We always have a Passover dinner. We have a seder. I have the recipe for gefilte fish from my grandmother.' The Brins were no different from their fellow immigrants in that being Jewish was an ethnic, not a religious experience. 'We felt our Jewishness in different ways, not by keeping kosher or going to synagogue. It is genetic,' explains Michael. 'We were not very religious. My wife doesn’t eat on Yom Kippur; I do.' Genia interjects: 'We always have a Passover dinner. We have a seder. I have the recipe for gefilte fish from my grandmother.' (More at The Story of Sergey Brin )

Page has a Jewish mother but seems to be even less actively Jewish than Brin.
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Mike Prozan
Mike Prozan, Jewish
Yep.  I always knew Sergey was.  But did not know that Larry qualified as well, depending on your definition.
 
Larry Page
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David Friedman
David Friedman, I have used Google products since the early 2000s.
A2A.

Yes, they are Jewish, to my knowledge.  I don't know if they're observant.
Myron Chaitovsky
Myron Chaitovsky, A lifelong Orthodox Jew, yeshiva trained (but not a Rabbi)

Are we keeping score?

Personally, I've never run into either at any synagogue or yeshiva I've attended.