Costanzo is an Italian given name, derived from the Latin word 'constantius', which means "steadfast" or "firm". This name has been traditionally used in Italy and other regions with significant Italian populations. It is composed of two elements: 'constans' meaning constant, steadfast, or firm, and '-o' being a suffix used to form masculine names in Italian. The name Costanzo peaked in popularity during the Middle Ages and was often associated with Italian nobility and prominent figures throughout history.
The name Costanzo experienced a notable decline in popularity between 1928 and 1932, with only half as many births recorded in the latter year compared to four years earlier.