The name Antoinette is a girl's name of French origin meaning "priceless one". Antoinette and is often added to lists like Unique Vintage Names for Girls and discussed in our forums with posts like "A brother or sister for little Jack or Olivia".
From the experts:
This feminization of Anthony, like other early French forms, such as Babette and Nanette, is not heard as often as it once was, but it could be time for a reappraisal of this delicate Gallic choice.
The name is most familiar via the ill-fated Marie Antoinette, wife of King Louis XVI during the French Revolution. Antoinette Giry is a character in Phantom of the Opera. And the theatrical Tony awards were named for theatrical actress and director Antoinette Perry (born Mary Antoinette).
Other options: Antonia and Antonella.