You are quite welcome for the DNA sites and other data. All this is new..even the DNA genealogy. While it is conclusive as to family lines, etc. DNA genealogy still has a way to go. As the Geneticists and Labs gather more and more samples, and have known roots to examine...they are modifying their projections from time to time.
In the beginning, the general consensus was that a father would pass on to his son, and exact duplicate of his own gene and Y-DNA. They determined that the gene could mutate maybe once in a 1000 years..there fore, a male today may have one marker difference in his DNA from a known male ancestor 1000 years ago. (thats stretching the time a bit..may not be 1000 years, but it is a very long time).
Today, the labs are determining that a father who is middled aged and above, who has a son..stands a high probability that the DNA between father and son may not be an exact match..so..the old theory pretty much went out the window. However, even if the DNA has mutated a bit, one to three points..there is still enough marker likeness plus the Haplogroup to determine family lines.
No, unfortunately..we SE Georgia Chancy, now Chancey's have not yet determined our ancestral roots. The furtherest known Chancey we have reasonably well documented was Jeremiah Chancey, born 1782 in South Carolina. Near Walterboro we believe.
We hope more Chancey's of the different clans will join us to help determine the surname association.
Unless Cliff Chancey has documented those Chauncey/Chancey's in Maryland and Virginia, I would not know...there is evidence that some of the Virginia Chancey's had relatives in West Virginia and Tennessee..if so, then there is little doubt that they are related to the New England Chaunceys...who by the way are documented back to Duke William, William the Conqueror's times, if not to that specific bloodline.
Charles Chauncey is generally accepted as the original immigrant of this surname...and may be, as the surname Chauncey goes...but, there was an earlier "Chancy" who came to Jamestown Virginia about 1620. He was a Huguenot, and his name was Charles as well. He and his family may not have survived the Indian massacres at and around Jamestown..but there was an Edward/Edmund Chancy who made his way across the Great Dismal Swamp in NE North Carolina to raise a family. We know little about this man, but believe he would have been born about 1635 to 1640..clearly a time frame that would separate that line from the New England Chaunceys...who, by the way were all very well educated and always used the spelling of the surname Chauncy or Chauncey. We Chancys of the pioneering type were not always as well educated, and we see our people written up as Chancey, Chancy, Chaney, Chauncey..etc. etc. all soundex spellings.
I certainly did not intend to write an epistle Cuck, forgive me, I get carried away with History sometimes..