M Ross
Foundlings, in Italy specifically, have an unique research knowledge base required.
For instance below, as you look through the record indexes etc....the Proietti's & Esposito's begin to really jump out at you.
Historical Cases
Into the nineteenth century, foundlings were often given surnames which actually indicated their illegitimacy. Proietti meant "cast out," Trovato literally meant "foundling," and D'Ignoti "of unknown" parents. Esposito derived directly from the Latin ex positum (literally "of this place") which appeared in some acts of baptism of foundlings. Legislation passed in 1928 outlawed the practice of assigning such children surnames indicative of their illegitimacy or abandonment, but surnames of some sort still had to be given to these children. These were sometimes the surnames of royal and noble families, but more often they were toponymic (geographical) in nature or alluded to the day, month or season of the child's birth (i.e. Sabato, Maggio, Primavera, and so forth).