The surname Contardo / Contaldi and its variants have an anthroponymic origin of Germanic root, linked to personal names spread in Italy during the Middle Ages.

According to E. Rossoni, they derive from the Lombard name Gunthard (also adopted by the Normans), documented in Lombardy from the 12th century. Among the historical testimonies there is mentioned Contardo of Butisino (Brescia area) and, in the 13th century, the Pavian nobleman Contardo d'Este, later canonised, which evidences the relevance and prestige of the name in aristocratic contexts.

For his part, V. Blunda goes deeper into the Germanic etymology of the name, linking it to the compound Gundi-Wald, formed by gundi ("combat, struggle") and wald ("power, command, authority"), meaning "lord of the battle" or "the one who governs in combat". This type of name was characteristic of the Lombard tradition and reflected military and hierarchical values peculiar to that culture.

As for the variants, Blunda notes that forms such as Contaldi respond to dialectal adaptations of southern Italy, where the voicing of consonants and other phonetic changes gave rise to new forms from the same original name.

As a whole, both interpretations agree in noting a Germanic origin linked to the military sphere and to power, with an evolution that, from prestigious medieval personal names, gave rise to different surnames distributed in various regions of Italy.