The name Claira is derived from the Latin word "clarus," which means "bright" or "clear." It's believed to have originated in the late Roman Empire, around the 4th or 5th century AD. The name was initially used in regions that were part of the Roman Empire, such as Italy, France, and Spain.

One of the earliest recorded instances of the name Claira can be found in the writings of the Roman philosopher Seneca, who lived from around 4 BC to 65 AD. He mentioned a woman named Claira in one of his letters, though little is known about her.

During the Middle Ages, the name gained popularity among the noble families of Europe. One notable figure was Claira of Toul, a French noblewoman who lived in the 12th century. She was known for her piety and her support of religious orders.

In the 13th century, there was a famous Italian poet and philosopher named Claira d'Anduze, who was born around 1230 in Anduze, France. She wrote several works on theology and philosophy, which were widely read during her time.

Another historical figure with the name Claira was Claira Gambacorti, an Italian noblewoman who lived in the 14th century. She was the daughter of the ruler of Pisa and is remembered for her role in the city's political affairs.

In the 16th century, there was a Spanish nun named Claira Isabella Eugenia, who lived from 1566 to 1633. She was known for her religious writings and her work in establishing convents and schools for women.

The name Claira remained popular throughout the centuries, though its popularity has waxed and waned in different regions and cultures. It continues to be used in various parts of the world, with different spellings and variations.