On the 26th I blogged about Jefferson Davis's genealogy. You may be interested to know that Samuel Davis (1788-1830) is the only brother of Jefferson who has been proved to have had surviving male offspring.
There may be other Davis family members who connect further up Jefferson's ancestral line, but Samuel is the closest and least questionable. It cannot be a descendant of Davis himself, because he had no male offspring, and it cannot be Jefferson's sister, Lucinda, because her male descendants carry the Y-chromosome of her husband. Tricky little "Y chromes" aren't they?
If you are a male Davis, and think you are kin, join the Davis Y-chromosome DNA Surname Project at FT DNA and get tested! Wouldn't it be great to know you were a descendant!