Similar to that of a doppleganger, it is another individual with the same name as you whose records and/or stories are mixed in with your own when you Google yourself.
A person who shares your name-- You find your googleganger by self-googling. The term comes from combining "Google" with the German expression, "Doppelganger."
"I got curious and googled myself last night-- and found a porn actress with my name! I can't believe my googleganger is a porn star!"
A googlebagger is an inept individual incapable of creating their own original insults in an internet debate, thus resorting to google for 'inspiration'
Taylor-" Fuck Ivan, every comment Mike threw at you I had seen before"