Dumb And no, they're an entirely new civilization, founded on some of the ideals of the old one. They were an ancient empire, and when some event happened (Maybe AIs? Unbidden endgame crisis from stellaris happened to them, they defeated them and then suddenly collapsed due to the pressure put on them because of the war?), they retreated to a planet, and forgot about their origins until about four or three thousand years ago, when one of the early communities found a partial database of the old empire, which didn't include it's name, and they wanted to expand to rediscover their history, and retake their territory, so maybe...