To Phyllis Jodice Forant,
I do not have the answer for the letter change "i" to "j," however my family tree has some similarities to yours.
My Great-Great-Grandfather's name was Gaetano Iodice. His wife's name was Rose Fornicola. My Great-Grandfather's name was Gennaro Jodice (or Iodice) and his wife was Olympia Cosenza.
Olympia came from Napoli to the United States in July, 1904. I believe that Gennaro came the over in 1903.
My question is: Could my Great-Grandfather be the brother of your Grandfather?