The social class system in the UK has shown incredible resiliency over the centuries. The names of Normans who came over after the conquest in 1066 are apparently still over-represented at Oxbridge [0]. Further, and per one study, "social status, wealth, education and occupational status was highly heritable – even more so than one’s height – and could be correlated to one’s family name".
[0] http://www.lse.ac.uk/website-archive/newsAndMedia/news/archi...
[1] https://www.cnbc.com/2013/10/30/whats-in-a-name-wealth-and-s...