[3] The Hay family share a common ancestor with the Earls of Erroll.

Gilbert de la Hay (died April 1333), ancestor of the Earls of Erroll, was the older brother of William de la Hay, ancestor of the Earls of Kinnoull.

In 1251, William received a charter of two carucates of land from his brother, which was confirmed by King Alexander III.

[3] In 1711, the unofficial prime minister Robert Harley, 1st Earl of Oxford and Earl Mortimer, made his son-in-law Viscount Dupplin Baron Hay of Pedwardine in the Peerage of Great Britain.

The heir apparent is the present holder's son, William Thomas Charles Hay, Viscount Dupplin (b.