Steve Sailor, doubtless ruefully, quotes an article from last year by Richard Savill.
In Britain, there is still a small but measurable difference in social metrics between people on different sides of the Ivanhoe gap after nearly a millennium. From The Telegraph in 2011:
People with Norman names wealthier than other Britons
People with “Norman” surnames like Darcy and Mandeville are still wealthier than the general population 1,000 years after their descendants conquered Britain, according to a study into social progress.
Research shows that the descendants of people who in 1858 had “rich” surnames such as Percy and Glanville, indicating they were descended from the French nobility, are still substantially wealthier in 2011 than those with traditionally “poor” or artisanal surnames.
Hat tip to Bird Dog.