Sorry, probably wasn't very clear in what i was saying.

My family line is Banks. In the early 1800's Richard Banks married Esther Davies, daughter of William Davies and niece of James Davies of Moor Court. Although William and James both married only William had any children and the only son died young. When James died, having outlived William, he left the majority of his estate to the children of Richard and Esther. One of the children, James Banks, could only inherit if he changed his surname, by Royal Licence or Act of Parliment, to Davies. From then on that branch of the Banks line had the surname Davies, although most also had Banks as a middle name. I wondered if the arms that James Davies of Moor Court was entitled to would then descend through the line of James Banks (Davies post 1858) or if they would end with the death of James Davies