Re: Burgess Surname DNA Project Report #10
Haplogroup B is very rare in the general population. The four participants in the Burgess DNA Project who are descended from Achilles Burgess don't come close to matching anyone else in the FT DNA database--but they match each other. All four tested positive for SNPs M181 and M60--an undifferentiated B. FT DNA doesn't currently offer tests for subclades of Group B, but there's no doubt these folks belong to that Group generally. Computer projections using DYS results are based on statistical models, and while generally accurate in cases where many examples are available, tend to become less certain and fragmented with fewer results to draw upon. There are very few "B" tests available for study.
As to possible ancestry for your line, I try always to think expansively. Remember that the Roman Empire controlled much of the Mediterranean region for centuries, and that Roman soldiers and traders were deliberately settled in early Britain as a matter of policy. Rome drew upon a wide range of native peoples living both in and out of the Empire for its recruits. Also, the British Isles have long been a crossroads region for sailors and merchants of all types. Achilles Burgess could be a descendant in the male line of one of these folks--or not, as the case may be. We may never know for sure. And we certainly can't date his migration (or that of his male-line ancestors) from any specific location or time without further matches.
One thing I can tell you: if you find a match with anyone else (including those of other surnames), they're likely to be related. In general, the scarcer the number base, the more likely it becomes that a random match signifies a potential relationship. All sprinkled with the usual caveats, of course. The same is often true of rare surnames.
We have very common haplogroups represented in the Burgess Project, and very rare ones. All tend to be become fairly distinct and differentiated, however, at 37 markers, with just a few exceptions--and these few can often be resolved with extensions to 67 markers.
You can always reach me directly through the e-mail links embedded in the Burgess DNA Project website (www.millefleurs.tv, under the "Burgess Genealogy" link).
Hope this helps.