The given name Blas is derived from the Latin name Blasius, which itself originated from the Greek word "blastos" meaning "sprout" or "offspring". This name has its roots in ancient Rome and Greece, and was initially used to refer to someone who was considered a "new shoot" or a child.

The name Blas gained popularity in the early Christian era, as it was borne by Saint Blasius, also known as Saint Blaise, who was a physician and bishop of Sebastea in modern-day Turkey in the 3rd century AD. According to legend, Saint Blasius was known for his ability to miraculously cure people and animals from illnesses, particularly those affecting the throat.

One of the earliest recorded instances of the name Blas can be found in the 12th century, when Blas de Baños, a Spanish monk and military leader, fought against the Moors during the Reconquista period in Spain. He was renowned for his bravery and military tactics, and his name became associated with valor and strength.

Throughout history, several notable individuals have borne the name Blas. Among them are:

1. Blas de Lezo (1689-1741), a Spanish naval officer and military leader who famously defended Cartagena de Indias against British forces in 1741.
2. Blas Cabrera (1878-1945), a Spanish physicist and engineer who made significant contributions to the study of magnetism and superconductivity.
3. Blas Infante (1885-1936), a Spanish writer, historian, and politician who was a prominent advocate for Andalusian nationalism and cultural identity.
4. Blas Galindo (1910-1993), a Mexican composer and conductor who was known for his contributions to the development of Mexican classical music.
5. Blas de Otero (1916-1979), a Spanish poet and a leading figure in the Generation of '36 literary movement, known for his socially conscious and existential poetry.

The name Blas has been used across various cultures and regions, particularly in Spain, Latin America, and parts of Europe. Despite its ancient origins, it has endured as a given name throughout the centuries, carrying with it a rich history and cultural significance.