I think Molly could be short for Margaret. That way, they could sort of have Theme Twin Naming, in a roundabout way. Margaret means "pearl" and Anthony means "priceless". If you know your Biblical parables, you'll get it.
There's a parable in the Bible called "The Pearl of Great Price". It describes a merchant who finds a pearl so valuable he sells all he has so that he can buy it. It's a parable on the justification of personal sacrifice.
William Afton is an Overlord.