I can't remember the numbers, but most of them did not inherit their money, they earned it.
The names that come to my mind are Google, Facebook, Microsoft, twitter, Buffet, Soros, Hollywood actors, and so forth.
I'm not coming up with a lot of names of people who actually "earned" it in the sense that I understand the term.
Sam Walton, yes, but his brood and their ilk that own Walmart nowadays? Nope.