Below is a series of surnames derived from the Latin cognomen Bassus and from the medieval adjective basso ("of short stature"), showing for each one its origin, variants and most notable areas of diffusion:

• Bassi – Pan-Italian surname with numerous variants (Basso, Bassa, Bassis, Bascio, Básciu, De Bassis, Bassich, Lo Basso, Lobasso, Li Bassi, Lobáscio, Lováscio). Very frequent in Lombardy and Emilia; in southern Italy and Liguria the forms Bascio/Básciu are common, while Bassich appears in eastern Veneto and the forms with "Lo" in the Neapolitan area.
• Basciano – With a single "s", peculiar to the south (especially the Neapolitan area). It derives from Bassus or from the medieval term basso, documented from the Early Middle Ages (for example: "Leo Bassus", Farfa 814; "Landulfus Bassus", Aversa 1160).
• Bassetti – Wide diffusion in northern Italy, with concentration in Lombardy, Emilia and Trentino, and presence in areas such as Forlì-Cesena, Ravenna, Milan and Varese.
• Bassetto – Decidedly Venetian, with strong presence in the province of Treviso and other areas of the Veneto.
• Bassini – Mainly spread in Brescia and the city of Milan.
• Bassoli – Predominates in Emilia (Modena, Reggio Emilia), Mantua and Milan, with notable presence in localities such as Carpi.
• Bassolino – Characteristic of Afragola (Neapolitan area) and nearby localities.
• Bassotti – With clusters in Rome and in the Ancona area (Marche).
• Bassino – Specific to Turin, where it appears as a reduced and local form.

Conclusion

Taken together, these surnames reflect a common origin linked to a medieval physical nickname based on stature, with a rich evolution in regional variants. Their distribution shows a strong presence in northern Italy, with some forms characteristic of the south, which shows the wide diffusion and adaptation of the term basso in Italian onomastics.