Dalviano

D'Alviano is an Italian surname of toponymic origin, derived from the place name Alviano in Umbria. The form with the initial d' (as in d'Alviano) is a conventional contraction meaning "of Alviano." Variants include Dalviano or D’Alviano in modern usage.

Historically, the name is associated with a noble family that took its name from the town and produced several military and clerical figures during the late Middle Ages and Renaissance. The most well-known bearer is Pietro d'Alviano (c. 1450–1511), a condottiero who commanded mercenary troops for the Republic of Venice and later for the Papal States during the Italian Wars. His career exemplified the mobility of condottieri in Renaissance Italy, moving between city-states' employers as alliances shifted.

In contemporary contexts the surname is carried by individuals in Italy and abroad, and is often found among descendants of the historic D'Alviano lineage. The town of Alviano remains a separate municipality in the Umbria region, illustrating the typical origin of such toponymic surnames.

See also Alviano, a comune in Umbria.