The name Alexa has its roots in the ancient Greek language. It is a feminine form of the masculine name Alexis, which is derived from the Greek word "alexo" meaning "to defend" or "to help". The name is believed to have originated sometime during the Classical period of ancient Greece, between the 5th and 4th centuries BC.

One of the earliest known references to the name Alexa can be found in Greek mythology. Alexa was the name of a Thessalian princess who was renowned for her beauty and virtue. She was said to have been courted by many suitors, but ultimately chose to remain unwed and devoted her life to the service of the goddess Artemis.

In the Middle Ages, the name Alexa gained popularity in various parts of Europe, particularly in regions with strong ties to the Byzantine Empire and the Eastern Orthodox Church. During this time, it was often associated with the concept of "defender" or "protector", reflecting the name's Greek origins.

The first recorded instance of the name Alexa dates back to the 12th century. One notable figure from this era was Alexa of Shaftesbury, an English abbess who lived from 1135 to 1187. She was known for her piety and her leadership of the Benedictine nunnery in Shaftesbury, Dorset.

In the Renaissance period, the name Alexa was embraced by humanist scholars and writers who were inspired by classical Greek culture. One such individual was Alexa Duglas (1555-1608), a Scottish poet and courtier who served as a lady-in-waiting to Queen Anne of Denmark.

Another notable figure was Alexa Wilding (1610-1662), an English actress and playwright who was celebrated for her performances in the theater companies of London during the reign of King Charles I.

In more recent history, Alexa Kenin (1904-1986) was a renowned American sculptor and artist who was known for her innovative use of materials and her contributions to the Modernist movement.

Alexa Grasso (born 1993) is a Mexican mixed martial artist who competes in the Ultimate Fighting Championship (UFC) and has held titles in various weight classes.

These are just a few examples of the rich history and diverse individuals who have borne the name Alexa throughout the centuries, reflecting its enduring appeal and timeless resonance.