If you are putting all of your information within your Google accounts, then they can really know what your private information is. I don't trust most of the applications available and since you can create a google account without putting your real name or real information, most of the people abuse that. The only thing is that Android phones can be tracked by Google.
Do you they only collecting the names and the other stuffs like these?
The even acquiring all our daily activities and you can find a option regarding this on google chrome which needs to be turned off if you don't want your actions to be on the hands of google but how many people know its existence.