Stay Current with McOsker McCusker MacCosker News

We will update this page as often as we have news to report!



July 2014 

Thanks to Luke McCusker for joining our DNA study, Luke does indeed match closest with Maguire from Fermanagh AND to McOsker. See the Newsletter archives for more details. Click Here to jump to the newsletter.

May 2013

We know that McCusker – McCosker - McOsker are a branch of the Maguires. We visited the Maguire Family History Weekend in Enniskillen, Co Fermanagh to see if they would agree with our findings. See the Maguire Weekend link at the top of these pages for more information.

March 11, 2013

We now have archives of our Newsletters. See the link in the Navigation Bar at the Top of the Page.

March 11, 2013

More evidence of our link to the Maguire kings. Carrickmacosker is only a few miles from the birthplace of Donn Carragh, and a few miles from the coronation place at Cornashee. See the March 2013 Newsletter for more details!


December 18, 2012

We now have a guestbook page. Please sign this and let us know where you are from. We hope to have visitors from around the globe! 


March 23, 2012

I just found a copy of the Annals of Ulster in Irish and Latin. The original text seems to confirm our assumptions that we are from Oscar, son of Art, son of Flaherty, son of Donn Carrach Mag Uidhir.

Original Irish Text: Matha mac Osgair Megh Uidhir, quieuit in Christo, decimo quarto Kalendas Nouembris, a derbrathair idon Seaan mac Oscair do marbadh isin lo cetna.

English Translation: Matthew, son of Oscar Mag Uidhir, rested in Christ on the 14th of the Kalends of November, and his brother John was killed on the same day.


March 17, 2012

Happy Saint Patrick Day! Our website now has an email server.

If you would like your own free email account, send us a message with your requested user name, i.e.

We will get this set up for you, and send back your user name, and a temporary password.

 Give it a try! Request your username at


March 14, 2012 - We now have a DNA Project of our own. We invite all McOsker, McCusker, MacCosker males to join our project. Visit us at


March 12, 2012 - We just received our initial DNA results, and it is very exciting. We do genetically match a project called Airghialla_Mag_Uidhi. These are descendants of Airghiallal born around 960 AD, and Airghiallal is the ggggg-grandfather of Donn Carrach Maguire . (see line 100 on the Ancient Lineage page of this website)

Better is the fact that we also match several different Maguire men in this project, and statistically we share a common ancestor with these men about 28 generations ago.  Remember that we believe our family McOsker split from Maguire around the year 1350 (660 yrs ago). 28 generations ago could be anywhere from 560 to 700 years ago.

Click here for more info Airghialla_Mag_Uidhi. Click on Y-DNA Results, then click on Classic. Ken McOsker is Kit 227667 on this chart, and the numbers of each genetic marker (columns) match very closely. Click on our link DNA Testing (above) as we have more much information on this.

More news to follow!