I wonder if your William could have a connection to mine. My GGGrandfather is William Atichison-Smith born about 1830 had a son William born in New Zealand in 1850. His full name is Colonel William Robert Terrington Dysart Aitchison-Smith. I have his father (1830) full name as William Baird Dysart Aitchison Smith. Probably a long shot... I have no other information besides descendants.