Toni, Tonia, Ani, Nia.
Famous people named Antonia:
Journalist (and sister of Nicole Kidman) Antonia Kidman; actress Antonia "Nia" Vardalos; chef Antonia Lofaso; novelist Antonia Byatt; former U.S. Surgeon General Antonia Coello Novello.
My Ántonia is the name of a 1918 novel written by Willa Cather.