Specific of the Bresciano, could derive from the name of Saxon origin Siwardus of which one has traces for example in a script of 1200: "... Quidam Siwardi studiosiores, Quo sinceriorem absenti fidem gererent... ". Additions provided by Giacomo Ganza/Villa di Tirano (SO) is a typical surname of the province of Brescia. Today it is concentrated as well as in Brescia città in Palazzolo Sull'oglio, Pontoglio, Pontevico and Mazzano, but it is present sporadically in at least twenty twenty other countries and in Milan. It would be originally from Palazzolo Sull'oglio, where it already appears in 1700, or in any case of the lower Brescia between the Oglio and Chiese rivers. Do not forget the Camuno-Valtellinese branch of Aprica (SO) flourishing until the middle of 1800, now almost extinct in the male line, because it divides between Villa di Tirano (SO) and Corteno Golgi (BS) and EdoloO (BS).
You may be interested
Verba Volant, Scripta Manent