Distribution: As a toponimic Cassano is typical of different areas in Italy, especially Apulia. The variation Cassanelli appears in the areas of Milan, Modena, Bologna, and Bari; Cassanello is very rare and typical of Genoa. Cassani seems to have three areas of origin, Lombardy, Emilia Romagna and the province of Genoa.
Surname Cassano and variation
Italian White Pages: the surname Cassano appears with over 2100 listings; Cassani with over 1100, Cassiano with 250, Cassiani with 280, Cassanelli with over 680.
Ellis Island: about 530 arrivals for Cassano immigrants are recorded; 140 for Cassani, about 60 Cassiani, 30 Cassanelli.