Nao, almost unique, is Venetian, from the area that includes Paduan and Venetian, should derive from an archaic dialectal nickname based on the Venetian term nao (napo or navone, species of elongated turnip whose scientific name is brassica napus), by extension this term, referring to man, means fool.
Buy a heraldic document with your coat of arms
You may be interested
Verba Volant, Scripta Manent