That’s not what that is. It’s 2 factors that combine into something very visible.
Children often follow in their parents footsteps career-wise. You can see it most obviously in politics and acting where names are important and they are highly visible. It carries on from age-old styles of hereditary work. You see parents do something as you grow up and if you try to do that you have built-in teaching and potentially a network to rely on. Bakers, scientists, actors, etc. It all works the same.
Name recognition. When you get the above, it becomes really easy to notice the same names. That can encourage followers to follow the name, assuming you’ll get similar things and quality. Look at Stephen King’s kid: while he’s good he gets attention simply because people think he will write as well as his dad. In politics you get that in spades where candidates live and die by their names and reputation. You see a Clinton, Kennedy, etc and remember the past and expect it. It takes a lot to break that expectation.