To utilize professional level databases for more info on google people search; here are links to the most effective tools:

NET DETECTIVE DATABASE ACCESS PAGE -  Typically, they prove to be a valuable help for finding google people search information.

WEB DETECTIVE DATABASE ACCESS PAGE - This a similar service utilizing slightly different databases.

NET-VESTIGATOR DATABASE ACCESS PAGE - A new entry into the database access field.

CYBERDETECTIVE DATABASE ACCESS PAGE - Very similar to Net Detective with minor variations.