When looking for a brand name there are different tools to help. One is to search the social networks for used brand name http://knowem.com/. Knowem.com is a way to search social networks to monitor your brand.
“KnowEm was developed to assist everyone – from individuals to Fortune 500 companies – in discovering where their names, brands, or trademarked terms are available (or stolen) on Social Media networks. KnowEm will not only help you secure your name across the vast social media landscape but we can also show you how to contact each site in order to have the name released and returned to you.” Text was excerpted from: http://knowem.com/about-us.php