Hi!!
My greatgrandmother was Iaquinta too!! Maybe we are distant relatives.
She was named Maria Serafina Iaquinta, from Verzino, a comune in Calabria about 30km from San Giovanni in Fiore. She, my greatgrandfather, Francesco Tomazzo Favaro, and their 7 children left Italy in december 1924, arriving in Brazil in january 1925. Another people of her family came too, here their name was changed to Jaquinto, that's all I know.
There is a page on Facebook about Verzino where I could found some information and distant relatives descedents of those that stayed in Italy. Maybe they can help you out.