Hi Misty, it is frustrating to not be able to find anything on these folks, isn't it. Do you know of a Ferguson male who could participate in the Ferguson DNA project? It took me about 3 years to find a distant cousin to do it, but it is worth it. You can check it out at: http://dna.cfsna.net/http://dna.cfsna.net/ Family Tree DNA has a new project, Family Finder, and both males and females can participate in it. My daughter has submitted her DNA for it, but it will take a couple of months to get the results back. It will find descendants of your gg-grandparents, assuming those relatives have submitted their DNA. I am excited about it and hope we find lots of relatives.
Try and find a Ferguson male to participate in the Y-DNA study.