The name Alessia is a feminine given name of Italian origin, derived from the male name Alessandro, which in turn is the Italian form of the Ancient Greek name Alexandros. Alexandros is composed of the elements "alexein," meaning "to defend," and "andros," meaning "man," thus translating to "defender of men."

Alessia gained popularity in the medieval era as a variant of the name Alessandra, which was a common name among Italian nobility. The earliest recorded instance of the name Alessia dates back to the 12th century, when it was borne by Alessia di Saluzzo, a member of the noble House of Saluzzo in northwestern Italy.

In the Renaissance period, the name Alessia was associated with several notable figures. Alessia Montalto (1455-1517) was an Italian humanist scholar and philosopher who taught at the University of Bologna. Alessia Serristori (1475-1555) was an influential member of the Florentine nobility and a patron of the arts, known for her support of artists such as Michelangelo.

During the Baroque era, the name Alessia was carried by Alessia Gentileschi (1593-1653), an Italian Baroque painter who was one of the most accomplished female artists of her time. Her works, including self-portraits and biblical scenes, are renowned for their dramatic use of light and psychological depth.

In the 19th century, Alessia Bonfanti (1835-1904) was an Italian operatic soprano who performed in major opera houses across Europe, including La Scala in Milan and the Royal Opera House in London. She was particularly acclaimed for her interpretations of roles in operas by Verdi and Donizetti.

Another notable figure from the 19th century was Alessia Marcucci (1862-1945), an Italian educator and feminist activist who fought for women's rights and access to education. She founded several schools for girls in Italy and was a prominent figure in the Italian women's movement.

While the name Alessia has ancient roots, it has remained a popular choice for Italian parents throughout history and continues to be widely used in Italy and other parts of the world today.