The surname Amalfi and its abbreviated forms have a clearly toponymic origin, linked to the city of Amalfi. According to E. De Felice, it is formed from the place name Amalfi and from its ethnonym Amalfitano, which designated the inhabitants or natives of that locality. In some variants, the loss of the initial vowel (A-) is observed, giving rise to reduced forms.

As for its diffusion, the surname is present mainly in southern Italy, especially in the Neapolitan area, which reflects the historical and cultural influence of Amalfi in that region.

For his part, E. Rossoni confirms this geographical origin and provides a significant historical reference: the surname is documented as early as the 13th century at the court of Frederick II of Swabia, with the mention of Crescius Amalfitanus, which shows its early use as an identification of origin.

Taken together, both interpretations agree in pointing to an origin linked to geographical provenance, where the surname Amalfitano preserves the memory of the link with the city of Amalfi and its historical identity.