Which spin-offs are more famous than their founders?

In the vein of the OP, Carthage was founded by Phoenicians, whose largest city was Tyre (along with Sidon and Byblos). While most dopers can name at least Tyre, I don’t think it’s nearly as well known to most people as Carthage.

Portland, OR, is named for Portland, ME (itself named for Portland, UK). One of the co-founders was from Portland, ME. Definitely a lot more famous.

Better stop there.

Carl’s Jr. is a famous fast food chain. Carl’s Drive-In Barbecue, the thing that it was a “Junior” version of, is not.