I suspect one of the longest lived names will be Julius Caesar; first his military and Roman history, then he is the name of a Shakespeare play which is a fame of its own, then he’s the name of the month July, and proxy related to August from Augustus Caesar. He’s the name of the Caesar Cipher in cryptography, and tangled up in the etymology of the Caesarian Section method of childbirth (which he probably didn’t have), the Caesar Salad (actually Caesar Cardini but often misunderstood (whom was the chef named after tho?)), and the German word Kaiser for Emperor e.g. Kaiser Wilhelm.

It’s a bit like if Martin Luther King became the dominant meaning of the word “King” and that became the reason “King” echoed down the centuries; famous things named after him so that everything King which isn’t named after him is often thought to be, or is a reminder of him.