Google was called Back Rub but they changed it to make people think that their company could handle a lot of data that other search engines couldn't. So far their is no internet information on the origin or creator of the original google logo. It was updated in 1998 and the colors were switched and an exclamation point was added around in 1999.
Then they hired Ruth Kedar to modify the brand logo. Her first try she did'nt want to mess to much with the text. So she added a pattern between the two o's, with the colors used in the previous logo, to symbolize an infinite connection.
She then focused on one of the o's using an infinite pattern and adding a target. This was to show that the Google search engine was very precise an complicated but simple to use.
In the next version their was a shift in the typeface and layout. The circles overlap and join with a target to show the globally targeted nature of the business. But she though it looked to much like the olympics logo.
After that they tried adding a magnifying glass as one of the o's and a target in the other. They also changed the font to ITC Leawood. They added the Google colors as well. In another version of it they got ride of the target and put a smile in the magnifying glass.
In the last reiterations of the logo they switched up the colors and tried tilting one if the o's. They also added a touch of dimension and shading.