If your surname is JORDAN you can help by establishing your branch via doing a Y37 or greater marker test via FTDNA. It is the only lab where that test is possible. If you are not male and have a JORDAN at a generation node in your pedigree, the family finder test can be helpful. But again it needs to be done via FTDNA. The reach of their FF test and the JORDAN cluster of kits already submitted (check out the JORDAN SURNAME PROJECT and you will see there are close to 500 kits listed as participating and I have almost 100 kits which are part of my nc1700sJordans Project and not included in the JORDAN SURNAME PROJECT.
The window to reach back to the Lords Proprietors' era is closing. We need JORDANS in GA, SC, VA, NC, TN, KY, IL, OH, WVA to establish their branches NOW before the window closes to trace back to the earliest JORDANS who arrived to the North American Continent.
So many published genealogies are wrong. It is very important for EACH JORDAN branch to include DNA in their family history work!