My grandmother was Letitia Hawley nee Duff and descended from Adam Duff of Clunybeg as shown in 'The Book of the Duffs', in particular the Elgin and London Duffs. Her father was John Edwad Duff, I think it was, who emigrated to New Zealand. I dont think John Edward Duff had any mail offsping. More detailed info if this is of interest.