There is an existing Pemberton surname study registered with the Guild of One-Name Studies, based in London, England. The Pemberton surname study is at http://www.one-name.org/profiles/pemberton.html. There is also a Pemberton family association called the Pemberton Family World Wide at http://pembertonfamily.com or http://pfww.org. This association is aggressively working to being Pemberton wills and other ancient records into its Pemberton Genealogy Storehouse at http://pembertonGenealogy.com. The family association sponsors a Pemberton DNA Project with several DNA profiles either already done or in process. Test kits for this study can be purchased within the Pemberton DNA Project at http://familytreedna.com/public/pemberton.
This DNA project has already succeeded in identifying precisely the DNA profile of one George Pemberton, born ca. 1685 in Cheshire, England.
There is information about the surname, its origins, meaning, etc on the one-name study page and on the Pemberton Family World Wide website.