The surname Barosso presents an uncertain origin, with interpretations referring both to descriptive nicknames and to possible patronymic derivations. According to E. Rossoni, it could derive from a nickname based on dialectal terms of northern Italy, such as the Ligurian baròs or the Piedmontese baròt, both meaning "stick" or "pole". In this case, the surname would have arisen as a reference to a characteristic object or to a trait associated with the person, in line with many medieval nicknames.

For his part, F. De Laurentiis proposes a different interpretation, suggesting that the surname could derive from Baroni. This hypothesis would link it indirectly with a patronymic or social origin, related to the title of "baron" or to families bearing that surname.

Taken together, both perspectives show a surname of possible double origin: on the one hand, as a descriptive nickname of dialectal root, and on the other, as a derivation of a more widespread surname. This diversity of interpretations reflects the complexity of onomastic evolution in the regions of northern Italy.