The oldest surnames of Canzo are Carpani, Masciadri, Pellizzoni, Ponti, Prina and Locatelli. The Carpani were one of the main families in the Corte de Casale administration, and have a house in Caslino; a castle appears in their coat of arms. The Masciadri surname is derived from the vocation of wandering peddler; Pellizzoni, in the modern shape, or Pelliccione, as it was during the Cinquecento, is the surname of a famous free captain who acted virtually as a vassal of Canzo during his life. Ponti/Conti-Ponti was a wealthy family linked with the silk industry. Prina is the oldest surname testified to by a written document, in which they appear as the owners of one third of Canzese territory, in name of the Cathedral of Monza's Capitle. They kept the land until the first years of the 20th century. Locatelli is probably the modern form of the surname Catelli/Catella, found in some medieval documents among Canzo's heads of families and also in a female saint, who was born in Canzo. Nowadays, Paredi and Pina are the most widespread and typical surnames: the first may have originally been the common denomination of a Welsh clan established in Canzo's mountains by the emperors as a border defence. It is famous because Saint Mir belonged to this clan. Pina is said to be a hybrid Spanish-Canzese family (Piña), or a Canzese family that had links with the Spanish administration, and became the most common.