The surname Como has two possible origins. According to E. De Felice, it may derive from hypocoristic forms created through aphaeresis of the personal name Giacomo. In this process, the initial syllable is dropped, giving rise to shortened forms such as Còmo, Comello, Cometto, Comino, Comuccio, and Comotto, which later developed into hereditary surnames.

E. Rossoni agrees that many branches of the surname originated from shortened forms of Giacomo, but notes that some families may instead derive their surname from the city of Como in Lombardy, making it a toponymic surname that identified a person's place of origin.

Historical Origins

The surname belongs to a broad group of family names derived from medieval personal names. The forms originating from Giacomo became especially common in northern Italy, where numerous diminutive and affectionate variants developed over the centuries.

At the same time, families who migrated from the city of Como could acquire the surname as an indication of their geographic origin, a common practice in medieval Italy.

Distribution

E. De Felice notes that the base forms Como and Comi are relatively rare, while their derived forms are more widespread, particularly in northeastern Italy, including the regions of Veneto, Friuli-Venezia Giulia, and Trentino-Alto Adige, as well as in Emilia-Romagna.

E. Rossoni identifies areas of presence in the provinces of Milan, Como, and Varese, where the surname may be linked directly to the Lombard place name. Additional family clusters are documented in the province of Alessandria, parts of central Italy, and southwestern Sicily.

Related Variants

• Comi – associated mainly with Lombardy.
• Comini – characteristic of Friuli-Venezia Giulia.
• Comìn – a Friulian variant.
• Cominotto – found primarily in Friuli-Venezia Giulia.
• Comina – linked to the locality of Comina, now part of Pordenone.
• Comello, Cometto, Comino, Comuccio, and Comotto – medieval derivatives formed from shortened versions of Giacomo.

Summary

Como is a relatively uncommon Italian surname that may derive either from shortened forms of the personal name Giacomo or from the city of Como in Lombardy. Both origins are well documented in Italian onomastics, and the surname forms part of a larger family of related names spread mainly across northern Italy.