Typical of Giussano and Seregno in the Milanese area, with important stocks also in Inverigo, Cantù, Mariano Comense and Cabiate in the Como area, and in Cassago Brianza and Barzanò in the Lecco area. additions provided by Simone Colzani The surname Colzani, frequent in the Alto Milanese, derives from the town of Colzano, part of the municipality of Brianza in Veduggio with Colzano (MI). The origin of the toponym (in Latin Caltianus) may be found in the Caltha plant, Ranuncolacea rather abundant in the surrounding lands and overlooking the river Lambro.
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