According to E. De Felice, Adimari is a surname derived from the Germanic personal name Ademaro or Adimaro (also found as Adamar and Adalmar), introduced into Italy by the Lombards and later reinforced by Frankish influence during the 8th and 9th centuries. The name is composed of the Germanic elements adal (“noble,” “of noble lineage”) and mar (“famous,” “renowned”), giving it the meaning of “famous for his nobility” or “distinguished by noble lineage.” De Felice notes that the name is documented in Tuscany as early as 865 and that the surname is historically associated with Florence and Tuscany.

E. Rossoni agrees with this interpretation and traces the surname to the medieval name Ademarus, documented from at least the 10th century. He likewise derives it from the Germanic elements adal (“noble”) and mar (“famous”), emphasizing its meaning of noble prestige and renown. Rossoni also recalls that the Adimari were one of the most influential Guelph families of medieval Florence, playing a prominent role in the city's political life during the 13th century.

V. Blunda confirms the surname’s derivation from the Germanic compound Athala Maru, carrying the same meaning of nobility and fame. He notes that the Adimari were an ancient Florentine family of Lombard origin mentioned by Dante Alighieri in the Divine Comedy and that the surname later reached Sicily through internal migrations within Italy.

Adimari is therefore a patronymic surname derived from the medieval personal name Ademaro or Adimaro, ultimately meaning “descendant of a noble and renowned ancestor.”