If we talk about the Su family, actually, not many in the Dark World are aware of them, yet those who are, undoubtedly belong to some ancient families with a history.
The Su family itself acts very discreetly and has no ambition for domination, and because there are very few direct descendants, the collateral members also do not intentionally mention their affiliation with the Su family, so there are really not many who have heard of the Su family's name.