Kage, I agree. It is entirely possible for such old families to be well renowned in the whole region. As NewSun mentioned, the O'Nidas family also came into wealth because of the eco-generators, so those three families could in fact know each other - although not as intimately. I'll put this out there that anyone with a wealthy background will be aware of the miracle child born out of a sculpture named Elizabeth Daedalus. It is also possible that at one point, her original sculpture was in the hands of one of those families. It would be rather interesting for an x year old Ella to know an x year old Noah, or even owned by the O'Nidas family when Aaron was still fully human. Ella was raised in an already exclusive group where her special circumstances her even more unique, and families that once "owned" her sculpture would definitely know about her. On the other hand, Ella didn't really pay much attention to the wealthy or royal. Feel free to incorporate it into your backstories if you think it would add to the story.

With that being said, she has been treated as a prized possession even before becoming sentient again, and because of her natural charm ability, attention and special treatment is something she has just grown accustomed to. She's stayed under the radar by calling herself Ella and staying away from high society, but she is nonetheless fairly noticeable even in a crowd of thousands, and it wouldn't be surprising for an O'Nidas or a Lucas to recognize her. 

That aside, it wouldn't be all that surprising for Virgil to know such wealthy families as well, but he has a knack for erasing his existence from the history books. He also doesn't find a point in remembering the names of families he has toyed with. Such families get swallowed by the drama he cleverly constructs up from their insecurities to even remember Virgil. Those who do remember him don't even realize just how much of an impact he had on their family's circumstances. Virgil pulls strings from the shadows. He is by no means a main character, and he is also too apathetic to be a villain. Without an external force driving him, he wouldn't even have a purpose at all, and he would be useless to the story without Ella. 

Anyway, I was away from the computer all day, but I will be writing again after this and will hopefully finish Virgil's introduction before the last participant realizes that the story has already started.