Antonia \a-nto-nia, an-tonia\ as a girl's name is pronounced ann-TONE-yah. It is of Latin origin. Feminine form of Anthony, used since classical times, when it was a common Roman feminine family name. Also a dimunitive of Ann. Toni is the pet form. Willa Cather novel "My Anton?"; English writer Antonia Fraser.
Antonia has 37 variant forms: Anteunette, Anthonia, Antoinette, Antoinetta, Antonella, Antonetta, Antonette, Antonie, Antonietta, Antonija, Antonina, Antonine, Antonique, Antonisha, Antoniya, Antonnette, Antonya, Netta, Nettie, Netty, Onita, Teunisje, To, Toinette, Toini, Tona, Tonechka, Tonette, Toni, Tonia, Tonie, Toos, Toosje, Tony, Tonya, Tunke and Tunna.