Link to STR data for Southern English L M20 (Brooker / Chandler)
My Family Tree DNA Y111 STR test results are in. Only yesterday, I predicted that ftDNA kit number 29369 could be of particular interest. That prediction has now been proven correct. Here is what I have learned since yesterday.
The 12 marker STR kit belonged to a descendant of a Thomas Chandler, that lived 1728 to 1782 at Basingstoke, Hampshire. Although only 12 markers - it proved a perfect match for my first 12. 100%. Family Tree DNA rated it's genetic distance as zero.
Basingstoke, Hampshire by modern road is only 32 miles (51 km) from Long Wittenham, Berkshire (now Oxon), where my surname ancestor, John Brooker lived, at the same time. Based on the limitation of a 12 marker comparison, FTDNA give 71% confidence to the testers sharing a common Y ancestor within 12 generations, and 91% confidence of us sharing a common Y ancestor within 24 generations. I'd say that suggests that myself and the present day descendant of Thomas Chandler, shared a common Y ancestral lineage until between circa 1500 and 1700.
So most likely, between the 16th and 17th centuries inclusive, the Y chromosome moved between two surnames, what we call an NPE (non parental event). Usually either illegitimacy, where the Y-DNA detached from the surname of the biological father, or simply, the biological father of an ancestor, was not the husband of their mother. This event most probably occurred in England, somewhere in the Hampshire, Berkshire, Oxfordshire area. Both my Brooker lineage record, and the Chandler record, merge somewhere in that area.
It gets better. Searches on FT-DNA, ySearch, and an email trail, revealed more Chandler Y cousins with an L haplogroup. All together, I have today found two 12 marker STR tests, that match my first 12 markers perfectly, with a prediction of zero genetic distance. I have found another 12 marker with slight difference, and a genetic distance of 1. I have found a 37 marker test with some differences, but that still gives a genetic distance of 3. A comparison with the Y37 test result, predicts 78% confidence of sharing a most recent common ancestor with me within 12 generations, and a 99% confidence of us sharing common Y descent within 24 generations. This correlates quite nicely with the two perfect 12 marker testers. All four testers are descended on the paternal line from Chandlers in the Basingstoke area.