THE O MAHONY SOCIETY

 

Surname yDNA Project

Project launched 1 August 2003 < Page revised 1 February 2008 < Page updated 19 June 2008

 

Origins of the O Mahony Surname

 

There are a great many O Mahonys in Ireland—the name is included, usually without the prefix O, among the hundred commonest surnames.  It belongs almost exclusively to West Munster.  The vast majority of Mahony and O Mahony births are registered today in Co. Cork, the area historically associated with the sept.  O Mahony chieftains were powerful, often described as princes.  Their principal territory comprised the modern barony of Kinelmeaky and extended to the sea, with some fourteen castles on the coast of southwest Cork.  The name O Mathghamhna—in modernized spelling O Mathuna—is derived from Mathghamhain (Irish for bear), the grandson of Brian Boru.  Mathghamhain was killed, with many more of the Desmond fighting men, at the Battle of Clontarf in 1014.  (Edward MacLysaght, Irish Families and Diarmuid O Murchadha, Family Names of County Cork)

 

All male O Mahony descendants, regardless of race, ethnicity or the precise spelling of their last name, are welcome and encouraged to participate in the O MAHONY Surname DNA project.  The project analyses the Y-chromosome to determine kinship.  Men inherit both their Y-chromosome and their surname from their fathers; and pass both on to their sons.  Women do not have a Y-chromosome, and traditionally adopt their husband’s surname.  Therefore, female descendants are only able to participate in the O MAHONY Surname DNA project through a male O’Mahony relative. 

 

JOIN THE PROJECT TODAY TO SEE YOUR ANCESTOR REPRESENTED!

 

(EUROPEANS: ORDER KITS LOCALLY FROM A EUROPEAN BRANCH)

Project Background

 

The O MAHONY Surname DNA project was begun on 1 August 2003 by Perry Streeter and was transferred in early 2007 to the O Mahony Society for ongoing administration.  It is currently administered by James Castellan.

 

Geneticists can now study the Y-chromosome DNA of males bearing all variations of the O MAHONY surname to determine whether or not they are related and the approximate degree of their kinship.  For an excellent explanation of this process, please see DNA 101 at the BLAIR DNA Project.

 

Using an ethical and competent testing company, Family Tree DNA, we are creating an O MAHONY Surname DNA database.  To address any concerns that you may have about privacy, please click here.  To collect a DNA sample, a simple, painless cheek-scraping test is used instead of a blood test.

 

Be aware that DNA testing can also reveal secret adoption or maternal infidelity anywhere in a lineage.  Consequently, any O MAHONY male who tests his DNA should be prepared for the minute possibility that he may not be an O MAHONY, genetically speaking.

 

Project Objectives

 

  • Identify how many distinct O MAHONY family lines originated in Ireland.
  • Determine whether or not O MAHONY Irish emigrants to a given country were related to each other.
  • Enable a living male O MAHONY anywhere in the world to possibly identify his Irish family of origin.

 

Project Results

 

Initial test results for this very small sample suggest that all O MAHONY descendants do not share a common ancestor as several of the columns for distinct markers have different values indicating a genetic difference between the individuals. To see the various reports summarizing the results go to

 

            O’Mahony Surname Project Participants’ Results Reports

 

 

Go to “Quick Interpretation Guide” for help understanding the technical details of how to derive meaning from differences in the numbers found in the tables.

 

A larger number of participants are needed before we expect to see more distinct family clusters forming. In time we hope to identify members of each cluster who are documented as being from specific areas of Cork and Kerry. Join now.

 

 

How to Participate in the Project

 

If you are a direct-line male O MAHONY descendant and would like to have your DNA tested for matches with others, simply click on the following link…

 

            O’MAHONY Surname Project at Family Tree DNA

 

            (Europeans can order a locally mailed test kit here saving 2-4 weeks mail delay.)

 

As a project participant, you will be eligible for a discounted test price of:

        $269 for a 67-marker test (ideal, one can always upgrade later)

        $189 for a 37-marker test (recommended)

        $148 for a 25-marker test

          $99 for a 12-marker test (discouraged, used primarily for variant spellings to rule out O’Mahony link)

plus a small fee for shipping & handling and return postage.

 

 

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