The origin of surname Ferrera is Negri in Italy.

Negri The surname derives from the Italian word "Negri" meaning Black.

Italian surnames have a large number of forms in comparison with other European surnames
because they reflect regional variations and the many dialects of Italian.
Examples are the surnames of northern Italy where it is very common family names have the suffix "I", while the south is the most common suffix with the "O".
You can add to the variety of surnames are due to variations in the subscription type that caused the medieval church officers.

Some variations of this surname are: Negri, Black, Nigri, Nigris, Nigra, Negris, Negrilli, Negrotto, Negrello and others.