The O’Mahonys A multi-disciplinary approach to a genetic surname study Cai Maver,
[email protected], 2017 May 30 Abstract The O’Mahonys are an Irish family who claim descent from Mahon, son of Cian, who lived in the 11th century AD and became chief of the Eóganacht Raithlind tribe of south Munster. The O’Mahony family is conspicuous in the historical record, with many named septs associated with specific lands in counties Cork and Kerry. This paper examines the genetic and geographic data of participants in the O’Mahony Surname Project to determine if any of the genetically distinct families bearing the surname can be connected to any particular person, sept, or lineage in the historical record. In doing so, this paper attempts to suggest which haplogroup the progenitor of the clan, Mahon, might have belonged to. Background The Historical Record The O’Mahonys are reputedly descendants of Corc, King of Munster, who lived in the fifth century AD (O’Hart, 1892; O’Mahony, 1913). Aside from the O’Mahonys, Corc is said to be the ancestor of all of the Eoghanacht clans who would become families such as the O’Sullivans, the MacCarthys, the O’Donoghues and the Stuarts of Scotland. However, we can’t assume that an ancestor’s surname indicates direct, patrilineal descent from a single common ancestor – in this early age, families might adopt the name of a famous ancestor regardless of whether that ancestor was on the mother’s or father’s side (O’Mahony, 1913). In examining the O’Mahonys, or any surname group, it is necessary to limit the investigation to the time period when surnames were passed down in a patrilineal manner.