Google isn't a word; it is a misspelling of “googol” [1], itself hardly a common word.

Or more technically correct: google wasn't a word when Google was founded, but today google is listed in dictionaries [2] as a verb that means searching for something on Google.

1. https://www.merriam-webster.com/dictionary/googol

2. https://www.merriam-webster.com/dictionary/google