The name Justo originated from the Latin word "justus," meaning "just" or "righteous." It first appeared during the Roman era and was used to describe someone who adhered to moral principles and lived a virtuous life.

This name has deep roots in the Christian tradition. In the Bible, Justus is mentioned as a surname for a Jewish Christian named Joseph, also known as Barsabbas. He was a disciple considered worthy to join the Twelve Apostles after Judas Iscariot's betrayal.

One of the earliest recorded individuals with the name Justo was Justo de Urgel, a Spanish bishop who lived in the late 8th century. He is remembered for his role in the Adoptionist controversy, a theological debate over the nature of Christ's sonship.

In the 12th century, Justo de Logroño was a Spanish monk and missionary who traveled to Denmark and Sweden, spreading Christianity in Scandinavia. His efforts contributed to the conversion of many people in the region.

During the Renaissance, Justo Lipsio (1547-1606) was a renowned Flemish philosopher, philologist, and humanist. He made significant contributions to the study of ancient texts and is considered one of the most influential scholars of his time.

In the 19th century, Justo Sierra (1848-1912) was a Mexican writer, philosopher, and politician. He served as Minister of Public Instruction and Rector of the National University of Mexico, playing a crucial role in reforming the country's educational system.

Another notable figure was Justo Rufino Barrios (1835-1885), a Guatemalan military officer and President. He initiated significant reforms and modernization efforts in his country, but his authoritarian rule led to political instability and eventual assassination.

These are just a few examples of individuals throughout history who carried the name Justo, reflecting its connection to principles of justice, righteousness, and moral integrity across different cultures and time periods.