De Górdún
de GÓRDÚN—XI—de Gordon, Gordon; Norman 'de Gordon,' i.e., of Gordon, a parish in Berwickshire; the name of a celebrated Scottish clan whose history goes back to Richard, lord of Gordon, about the middle of the 12th century. There were Gordons in Ireland as early as the middle of the 14th century, but the name was rare until after the plantation of Ulster. The modern Scottish form of the name is Górdon or Górdan.
Alphabetical Index to Irish Surnames