Jackson Family Genealogy
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Jackson Clan DNA Project

Updated 24 July 2021
by John R. McAnally

This Jackson clan is larger than the place name (Hempstead) implies.  New testing techniques have provided means whereby we can cheaply determine your patriarch and which branch of this patriline that you belong to.   No longer should the  descendants of Robert Jackson refer to themselves as Hempstead Jacksons, but more precisely by the technical term haplogroup I-Y9389 or I-Y38787.   All this comes from the recent advancement in YDNA testing called the Big Y, a change from the original maximum of 111 marker STR (short tandem repeat) test to a combination of 700 marker STRs plus approximately 70,000 of the SNP (single nucleotide polymorphism) test.  (But those I-Y numbers are not handily remembered so for convenience we call this whole Clan 'Hempstead' for lack of a better name.)

Presently there are three branches and one subgroup of this clan that are defined by five patriarchs. To get a picture of the structure, size and interrelationships go to   https://www.familytreedna.com/public/y-dna-haplotree/I;name=I-Y38787.
Notice the downstream time locations starting with the progenitor haplogroup I-Y8950 then in sequence to subgroups I-Y9389 and I-BY19809.  YFull analysis indicates that TMRCA between I-Y8950 and I-Y9389 is 350 years before present and another 500 years before present to I-BY19809.

I-Y8950: Graham Jackson of Australia, is a descendant of Thomas Jackson b. abt 1797 d. abt 1860 of Ireland.   Graham was negative for the SNP test of I-Y9349 and I-BY19809 which means his progenitor forms our third Jackson clan branch.  He has taken the Big Y test but does not have a match and therefore does not at this time have a terminal SNP determined. He is classified in the haplogroup I-M223 as I-Y8950, but this is not terminal and therefore cannot be used to determine a close relationship.  If someone took an SNP test for I-Y8950 and matched Graham this would imply only that they are in a large haplogroup classification but not necessarily closely related.   A similar situation as two individuals being in the large haplogroup I-M223.  At FTDNA posting the haplogroup in green implies that the person has been proven via testing to be in that group and those in red are just predictions from an analysis of the STR results. 

I-Y9389: Robert Jackson b. England 1615/20 d. 1683 Queens Co. New York and Samuel Jackson b. 1757 Ireland d. 1834 Greene Co., Pennsylvania combining to make the largest group of participants tested.   By that we mean that a direct male descendant of each patriarch has done the Big Y test and it has shown that these two men are a match that indicates they have a common ancestor in the 1500s.  Any male Jackson that conjectures that he is a direct male descendant of these patriarchs but cannot prove such via standard genealogical proofs can prove such via this SNP test at FTDNA at the cost of $39 or at SEQ at the cost of $18.  

I-Y38787:This subgroup of I-Y9389 has the patriarch of General Joseph Jackson, the great-grandson of Robert Jackson.

BY-19809: The third branch formed by Samuel Jackson b. abt 1650 d. 1722 Stafford Co., Virginia, and John Lynn b. abt 1730 Stafford Co., Virginia d. 1794 Fauquier Co., Virginia has determined their MRCA as 150 years before present which implies that they have a common ancestor in the named Samuel Jackson, thereby meaning John Lynn was a direct male descendant of Samuel Jackson.  Regardless, this match has established a third branch of our Jackson clan that is distinct from the haplogroup I-Y8950   Any male Jackson that conjectures that he is a direct male descendant of either of these patriarchs but cannot prove such via standard genealogical proofs can prove such via this SNP test at YSEQ at a cost of $18. Of the five patriarchs only one, that of Thomas Jackson (b. abt 1797 Ireland d. aft 1873 Ireland) has records of a marriage and births of children that can provide a point of reference so that further research in Ireland/UK can be done. The other patriarchs' records end within the United States or with only family lore conjectures to the old country.

There are 54 Jackson men of our clan out of nearly 700 total YDNA participants in the Jackson Surname Project at FTDNA.  Five have not been able to establish a connection to any of the five patriarchs nor have extended their pedigree further back in time to be so named, ie having found their patriarch.  These men could be descendants of the established branches or anyone of them might be a separate branch.  The recent Big Y testing and subsequent SNP testing can now be used to test which branch they belong to.  See https://www.familytreedna.com/groups/jackson/about/results for Member Contributed Lineages grouped according to the members' tested results.    It has been a BIG job getting the Family Finder results merged in.  Thanks for your patience!  Remember this is all volunteer work by people who care!

This google spreadsheet was prepared to help you visualize the relationships and connections of the Hempstead Clan descendants who have participated in DNA testing.   If you see that there are folks missing from this s/s, please let Janie know.

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Copyright 2017-2021, all rights reserved by John R. McAnally.    You are welcome to use any of this information for your personal use, but it may not be copied, uploaded on any web site without proper acknowledgement..  This page  by John R. McAnally was updated October 2017, February 2020, and July 2021 as new information is learned.