Calderara is widespread in Lombardy at Agnadello (CR), Milan, Besnate and Cuasso Al Monte (VA) and throughout the Varese area, in Emilia and San Bonifacio (VR), Calderari, less widespread, has a small stock in Pieve di Soligo ( TV), in Bologna and a nucleus in Lazio, Rome, Anticoli Corrado (RM), Ceccano (FR) and Orte (VT), Calderaro has a stock in the Paduan area and various groups in the south, in Puglia, Basilicata, Calabria and Sicily , they should all derive from the trade of artisans producing pots and boilers, but in some cases they may derive from a toponym like Calderara (MI) or Calderara di Reno (BO).
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