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This project is a meeting place for users who share the J2a2a Y-DNA haplogroup, which means they are related along their paternal lines. Users in this group may want to share their family trees with each other to find overlaps and merge duplicate profiles in order to join or expand the World Family Tree and discover new relatives.

This project is about a Y-haplogroup, which defines a group of men by a shared set of inherited features in the DNA of their Y-chromosome. This implies they have a patrilineal ancestor in common, because only males carry a Y-chromosome, which they inherit from their father. The major Y-haplogroups were formed thousands of years ago, and therefore each group can today include thousands to millions of men. For an introduction, you can visit the Y-DNA Haplogroups project, the DNA Testing project, or start at the beginning with the DNA Primer project.

This haplogroup project's name uses the older, now secondary, hierarchical format for Y-chromosome haplogroup names. Because the haplogroup names under this earlier system would change with the identification of new branches, it's no longer possible to know unambiguously to which current haplogroup this designation refers. Anyone with an old test result that assigned them to a Y-haplogroup with this name should update their information to use a shorthand format name that references a defining SNP.

Based on the known naming history, which may be incomplete, people assigned in the past to the J2a2a Y-haplogroup would probably be correctly assigned to either the J2a-P279 or J2a-M92 haplogroup.

Naming History

The information below is provided as an aid to figuring out which haplogroup under the shorthand naming system corresponds to "J2a2a" assignments that did not include a defining SNP. All past usages of the J2a2a name that have been found so far are listed, but this list may not be complete. For documentation, see "Resolving Y-Haplogroup Hierarchical Naming Ambiguities."

  • ISOGG
    • J2a2a-P279 (ISOGG 6.98, 2011 Nov 19) -- Earliest ISOGG usage for J2a2a.
    • J2a2a-P279/PF5065 (ISOGG 8.68, 2013 Aug 19)
    • J2a2a-P279/PF5065 (ISOGG 12.1, 2017 Jan 1)
  • YCC
    • In YCC 2003, J-M92 was named J2f1, J2a was defined by M47, and no haplogroup named J2a2a appears.
    • In YCC/ftDNA 2005, on the updated Family Tree DNA poster, J-M92 was named J2f1, J2a was defined by M47, and no haplogroup named J2a2a appears.
    • J2a2a-M92 (YCC 2008)