The Family Tree on this site is mainly the descendents of Hugh McOsker, b 1787 in Co. Fermanagh Ireland. The VAST majority of this information was compiled by Richard McOsker (Kansas) and his late father Darrell Eugene McOsker. (Click the Family Tree tab above)
Historians state that McOsker – MacCusker – MacCosker are principally a branch of the MacGuires in Fermanagh, a county in Northern Ireland.
We believe that we are descended from Oscar Mag Uidhir, the great-grandson of Donn Carragh Mag Uidhir (pronounced Mag Uwarr), the 1st Maguire Prince of Fermanagh.