Names in STO are not unique save for what comes after the @ symbol.
So, everyone will be able to make a Sancta, only the rest of it will be different like Sancta@Bob or Sancta@Bobby - however the same person cannot have more than one of any one name on a single account. This also applies to ship names. I'm not sure about Fleet names however.
Just don't want you to think otherwise and then find someone with the same name as you and be like WHAT!?