In recent years, the new science of
Genetic Genealogy has been developed which applies DNA analysis to Genealogy. This measures the changes between parts of the Y-chromosome and how it affects people's descendants. The Y-chromosome is unique to the male line, as are surnames. The female line is also studied from the X-chromosome, but is not as useful for Genetic Genealogy since there are fewer changes to track. There are two kinds of analysis called STR and SNP.
STR was the first developed and the less accurate. The changes occur very often which leads to a lot of uncertainty. It is now just used to locate distant relatives within a couple of hundred years. An STR analysis is shown in the graphic below.
SNP was developed later and is much more definite. The changes occur seldom and are very rarley repeated. This is not useful for finding cousins (as of now), but is very useful in tracking the movements of peoples and tribes going back thousands of years.
The Hoy family is an SNP called M222.
The major breakthrough for Irish Genetic Genealogy was a paper by Brian McEvoy of Trinity College, Dublin published in 2006. In it he discovered an STR signature that was very prominent in the northwest section of Ireland over to the southwest of Scotland. There were about 65 Irish surnames studied in the paper, and the Haugheys and Dunleavys were included. All of the names were normalized to avoid confusion, so Hoy became Haughey. MacDunveavy was a part of the Hoy family, so they are of interest to us.
Later David Wilson discovered the SNP associated with McEvoy's STR signature and it was called M222. Two Easton Hoys have been tested and we are M222. The Haugheys and Dunleavys in McEvoys paper who are M222 are shown below with their STR data. Fourteen of the nineteen Haugheys in the study were M222 and five of the twelve Dunleavys were. The Easton Hoys match the men in this table very well.
Fuller and more current information is to be found here.