Note 28 — VIII Proper Names in America
Reading edition
They arose in England through the custom of requiring an heir by the female line to adopt the family name on inheriting the family property. Formerly the heir dropped his own surname. Thus the ancestor of the present Duke of Northumberland, born Smithson, took the ancient name of Percy on succeeding to the underlying earldom in the eighteenth century. But about a hundred years ago, heirs in like case began to join the two names by hyphenation, and such names are now very common in the British peerage. Thus the surname of Lord Barrymore is Smith-Barry, that of Lord Vernon is Venables-Vernon, and that of the Earl of Wharncliffe is Montagu-Stuart-Wortley-Mackenzie.