It's not a bad idea to create a space between your professional and personal lives when you're online. An online alias is a good way to immediately distance your personal life from your career-minded online identity.
This tactic will keep most people from finding your personal items to begin with. In most cases, a casual surfer shouldn't be able to connect your professional name to private, personal alias. Best of all, embarrassing content is connected to your personal alias instead of your professional name.
However, if the worst happens and your good name is smeared across the Web in a way that destroys your credibility, you may need to take drastic action. The best way to fix a ruined reputation is to clean the slate and create a new name to use online, not try to undo what you've done with your given name.
You can reestablish profiles and content across the Web using a slightly different name, perhaps using your middle name as your first name. Then you can more carefully safeguard this identity as you move on with your life.