Elaborated form of Erma, from Germanic 'ermen' meaning whole or universal.
Ermadine is an elaborated form of Erma, from the Germanic root ermen meaning whole or universal. That root has a grand, inclusive feeling, even when the name itself is softened by a later ending.
Ermadine has the lushness of an older-fashioned invention, the kind of name that stretches a concise root into something more ornate and feminine. It feels rare, somewhat vintage, and quietly dignified. The elaboration gives it a musicality that can make a simple etymology feel ceremonious.