Mary Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
James William Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Fife Duff1 
He gained the rank of Midshipman in the Royal Navy.1
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
John Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Isabella Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Catherine Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Anne Duff1 
Her married name became Biggar.1
Child of Anne Duff and Walter Biggar
- Margaret Catherine Biggar+1 b. 6 Dec 1823, d. 25 Jul 1915
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Walter Biggar1

Walter Biggar was born in 1787 at Edinburgh, Midlothian, ScotlandG.1 He is the son of Robert Biggar and Louisa Balfour.1 He married Anne Duff, daughter of James Duff and Margaret Ogilvie Dunbar, at Banff, Banffshire, ScotlandG.1
Child of Walter Biggar and Anne Duff
- Margaret Catherine Biggar+1 b. 6 Dec 1823, d. 25 Jul 1915
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Sophia Duff1 
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
John Duff1 
He lived at Elgin, Morayshire, ScotlandG.1
Children of John Duff and Margaret Gordon
- Patrick Duff1 b. 19 Aug 1719
- William Duff1 b. 5 Sep 1720
- Helen Duff1 b. 1 Jul 1722
- Alexander Duff1 b. 7 Dec 1723
- John Duff1 b. 11 May 1725
- Margaret Duff1 b. 13 Aug 1726
- Anne Duff1 b. 18 Dec 1727
- John Duff1 b. 26 Mar 1729
- Archibald Duff+1 b. 20 Jun 1731
- John Duff1 b. 20 Oct 1734
- James Duff1 b. 12 Apr 1736
- Helen Duff1 b. 11 Jun 1737
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”