The presentation will connect the traditional genealogy of the O’Neill septs to their genetic signatures using Y STR and haplogroup markers. The focus will be on the Tyrone, McShane, Fews and Clanaboy septs and the unique DNA characteristics of this “O’Neill Variety”. In addition, the Ui Neill as descendants of Nial of the Nine Hostages and his son Eóghain (Cenél Eóghain) will be detailed. Other septs will be highlighted including the O’Neills of Leinster, Eoghanachta and Thomond and how they differentiate. Widespread testing using Big Y has greatly contributed to our current understanding.

This lecture was presented at Genetic Genealogy Ireland 2018 in Dublin. Please note that these GGI2018 videos are copyrighted to the presenter and should only be used for personal study. They are not to be used for any other purpose without the presenter’s express permission. Also, please note that because this is a rapidly advancing field, the content may quickly become outdated. The lectures were sponsored by FamilyTreeDNA (at and organised by Maurice Gleeson, a volunteer from ISOGG (International Society of Genetic Genealogy at ISOGG volunteers provided free DNA advice and support for members of the public at the conference.