Capt Leyson Hopkin Davy was my GGG grandfather. I have written a book which contains a chapter or two on him and his family and more recently have written an (unpublished) supplement with quite a bit on the the Kiwi side, all of whom you would be interested in.
His eldest daughter Caroline Vaughan Davy married William Walker Wilkins who was my GG grandfather.
I am currently travelling but if you are interested you can contact me on my personal email address: firstname.lastname@example.org
Dave Wilkins (Sydney Australia)