House of Hay

Cadet Branches
House Hay of Yester
Lords of Yester and Locherworth
Lords Hay of Yester
Earls and Marquesses of Tweeddale
Issued from Robert de Haya, 2nd son of William de Haya, 1st Lord of Erroll
House Hay of Naughton
Lords of Naughton
Issued from John de Haya of Ardnaughton, Sherriff of Perth 2nd son of William de Haya, 2nd of Erroll
House Hay of Leys
Lords of Leys and Randerston
Issued from William de Haya, 2nd son of David de Haya, 3rd of Erroll
House Hay of Delgatie
Lords of Dronlaw, Delgatie and Ardendraught
Issued from Gilbert Hay, 2nd son of Thomas Hay, 7th of Erroll
House Hay of Fudie
Lords of Fudie and Cassingray
Issued from Nicholas Hay, younger son of William Hay, 8th of Erroll
House Hay of Urie
Lords of Urie and Cassingray
Issued from Gilbert Hay, younger son of Gilbert Hay, 9th of Erroll and younger brother of William Hay, 1st Earl of Erroll
House Hay of Laxfirth
Lords of Nether Inch and Laxfirth
Shetland branch
Uncertain cadency
House Hay of Strowie
Lords of Strowie
Uncertain cadency
House of Boyd-Hay
Lords Hay and Slains
Earls of Erroll
Barons Kilmarnock
Hereditary High Constables of Scotland
Matrilineal branch issued from Mary Hay, 14th Countess of Erroll

Personal Arms
William Hay
3rd Earl of Erroll
Younger son of William Hay, 1st Earl of Erroll and younger brother of Nicholas Hay, 2nd Earl of Erroll