The Duff family is descended from James Duff and Christian Simpson.  Although this parentage is deduced only from IGI data, the fact that Margaret Duff married in Markinch and named her second son and first daughter James and Christian makes coincidence rather unlikely.

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1 James Duff b: Abt. 1743 Markinch, Fife
  +Christian Simpson b: Abt. 1747 Markinch, Fife
         m: 9 October 1768 Markinch, Fife

        2 James Duff b: 23 March 1770 Markinch, Fife
            +Christian Duncan m: 6 June 1801 Markinch, Fife
        2 Robert Duff b: 23 March 1770 Markinch, Fife
            +Agnes Daw/Dall m: 20 December 1798 Markinch, Fife

                3 James Duff b: 27 Aug 1799 Markinch, Fife
                3 Andrew Duff b: 7 August 1801 Markinch, Fife
                3 Robert Duff b: 4 June 1803 Markinch, Fife
                3 John Duff b: 13 February 1805 Markinch, Fife
                3 Janet Duff b: 16 February 1807 Markinch, Fife
                3 George Duff b: 19 June 1809 Markinch, Fife

        2 Andrew Duff b: 6 January 1772 Markinch, Fife
        2 Christian Duff b: 4 September 1775 Markinch, Fife
        2 Margaret Duff b: 26 March 1777 Markinch, Fife
           +George Birrell m: 22 April 1803 Markinch, Fife

Tree continued in Birrell family tree

         2 Betty Duff b: 5 September 1781 Markinch, Fife
         2 Agnes Duff b: 25 March 1785 Markinch, Fife

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