The surname Costante derives from the Latin cognomen Constans, meaning "firm," "steadfast," or "persevering," and from its derivative Constantinus. It belongs to the large family of surnames that originated from the personal names Costante, Costantino, and Costanzo, which became widespread throughout Italy during the Christian era.

Origin and Development

F. Miranda recalls that the name was already known in Roman times through Emperor Flavius Julius Constans, the third son of Constantine the Great, who ruled between 337 and 350 AD. The name later gained popularity in Christian culture, where constancy was associated with steadfastness in faith.

A. Bongioanni notes that the spread of the name was further encouraged by the cult of twelve Christian saints named Costante or Costantino. Over time, these personal names evolved into hereditary surnames and generated numerous regional variants throughout Italy.

Regional Variants

A. Bongioanni documents several surnames derived from the same root:

• Costantini, particularly common in Friuli-Venezia Giulia, especially in Tricesimo.
• Tantin and Tintin, Friulian forms documented as Tintinus in the Thesaurus Ecclesiasticus of Aquileia.
• Costanzo, especially frequent in the province of Cuneo.
• Incostante, recorded in the Napoli area, formed through the addition of a prothetic prefix.
• Tanzi and Constantiani, which also derive from the same Latin root.

Distribution

According to F. Miranda, surnames derived from Constans and Constantinus are found throughout Italy, with notable presence in Campania, Puglia, Calabria, Sicilia, Basilicata, Piemonte, Lombardia, Abruzzo, Lazio, Friuli-Venezia Giulia, and Veneto. In Sicily, these surnames are documented in all provinces.

Summary

Costante is an Italian surname derived from the Latin names Constans and Constantinus, meaning "firm," "steadfast," or "persevering." Its diffusion was encouraged by Roman history and Christian tradition, particularly through the veneration of numerous saints. The surname belongs to a large family of related forms, including Costantini and Costanzo, and is found throughout Italy, especially in southern regions and Sicily.