“Upon hearing about an Indian caste system comprised of five main castes, each of which is divided into about 3,000 sub-castes based on occupation, most foreigners contextualize the concept as being quite alien. People of Anglo-Saxon descent may come to this conclusion forgetting that many of their brethren still walk around with names like Smith and Tailor attached to them—names that hail from a similar caste system. That’s right: In the medieval period, families often maintained specialist trades passed down from one generation to the next. While the Anglo-Saxon caste system was never as strict as that which ultimately developed in India, it wasn’t profoundly less strict than its pre-British Indian counterpart. . . .  What is fascinating about caste systems, and likely a core reason they evolved in so many cultures, is that they allow for the genetic concentration of skills within certain specialties. As offensive as this concept is, the genetic vortices created by castes are so strong that their effects can be seen centuries after they dissolved. A study  conducted in the U.K. in 2015 found that people with the surname Smith (descended from the smith caste) had higher physical capabilities and an above-average aptitude for strength-related activities, while those with the surname Tailor (descended from the tailor caste) had a higher-than-average aptitude for dexterity-related tasks.”