Regardless of what type of search engine you use, if they have a common name you may get numerous hits. Tips to help you are: Research each link you get. While you may gather plenty of information this way, you may also find areas you're not Email Database sure are relevant. Make notes of these bits of information and bookmark the sites linked so you can find them again easily later. Use whatever identifying information you have on this individual to confirm or negate the links you have found.
Once you have done the above, compile any information you do find. Maybe the link brought you to a web site on a specific interest, such as Email Database collecting antiques - now you know an interest of your subject you may not have known before, which opens Email Database up additional areas of investigation. Often, specific interest web sites, message boards, etc., will require a person to become a member in order to post, which means they will have a login name for that site.
In many cases, these login names are noted ALONG WITH the individual's real life name. If you find a login name at any of the links associated with the person's real life name, write it down. Most people use the same, or similar, "handles", in every Email Database situation that they have to sign in to use a service. Now you have another keyword to use as search criteria. Try this on yourself if you are doubtful...use your personal login name as Email Database search criteria and see what pops up, you'll probably be surprised at how often posts you have made are linked for the world to see.