Can you delete personal information from Google? not really. I say 'not really' because you can delete personal information online, but there's so much of it and on sites you can't control that it's a waste of time.
Most of people's personal information online comes from social-networking sites like Facebook, Myspace, Twitter, Google+, etc.
Sure you can make use of privacy settings on these online communities, but there will always be 'people search' websites out there allowing anyone to see your full name, age, phone number, address and relatives.
Request personal information removal
On privately owned websites, including people search' websites, you can contact the site owner and request your personal data be removed. If they're are so kind to do so, your info will stop being crawled within a month. To speed up the process you can next submit a Google removal request.
People search websites
Here is a list of 10 people search websites out of the thousands that exist. These websites are the real problem when it comes to making your personal info public.