It gets even better than that - Neander also changed his name from German Neumann "new man" to Greek Ne-Ander (also "new man"). So, Neanderthals, the "newly discovered men" were coincidentally from the "new man valley", named after a guy who changed his name from "new man" to "new man".

The "thal" in Neanderthal, meaning "valley", is also the word from which we get the money denomination "thaler", whence "dollar"!

This reminds me of the bird called the canary which means dog. It gets its name because some islands were discovered that had a bunch of wild dogs, and they named them the Canary Islands (from canine). Later on it was discovered that a small yellow bird was endemic to the islands so they named it after the place they lived.