The surname Lamanna is typical of southern Italy, and belongs to a group of surnames formed from the expression "La Magna", where magna means "great, big". It is important to make clear from the outset that this is not a place name, but a surname born of a descriptive expression.

According to E. Rossoni, surnames such as La Magna, La Manna, Lamanna and Lamagna may have originated as a way of identifying:

• a large house,
• an important property,
• or even a person of great size or standing within the community.

Over time, the expression with the article (La Magna) became fixed as a hereditary surname, first as two words and later joined into one (Lamanna).

Other possible explanations of the origin

Besides the most direct reading, tied to the adjective magna ("great"), Rossoni mentions other complementary hypotheses:

• a possible relation to modifications of Lombard terms, such as arimanno (a free man in Lombard society),
• or a reference to Alamagna, the medieval name by which Germany was designated, which in some cases may have served to identify people coming from Germanic lands.

These hypotheses are not mutually exclusive and reflect the complexity of the surname's origin, especially in areas of the south that received diverse influences over the centuries.