The name Cager has its origins in the Old English language, dating back to the 5th century AD. It is derived from the Old English word "cæg," which means "key" or "lock." This suggests that the name may have been associated with professions involving keys or locksmithing in its early history.

During the Anglo-Saxon period in Britain, the name Cager was primarily found in the regions of Wessex and Mercia, where Old English was the predominant language. It was not uncommon for people to be named after their occupations or traits during this time, which could explain the name's connection to keys or locks.

One of the earliest recorded instances of the name Cager can be found in the Domesday Book, a comprehensive survey of landholdings and population in England commissioned by William the Conqueror in 1086. The entry mentions a man named Cager the Smith, suggesting that he may have been a blacksmith or metalworker.

In the 12th century, a monk named Cager of Canterbury is mentioned in the chronicles of the Benedictine abbey of St. Augustine's in Canterbury. He is said to have been a skilled scribe and calligrapher, renowned for his beautiful handwriting and illuminated manuscripts.

During the Middle Ages, the name Cager appeared in various historical records and documents, indicating its continued usage. One notable bearer of the name was Sir Cager de Montfort (c. 1230-1291), a English knight and military commander who fought in the Barons' War against King Henry III.

In the 16th century, a renowned English playwright and poet named Cager Jonson (c. 1572-1637) gained fame for his works, including the famous comedies "The Alchemist" and "Volpone." He is considered one of the leading literary figures of the Jacobean era.

Another historical figure with the name Cager was Cager Stukeley (c. 1687-1765), a renowned English antiquarian, naturalist, and writer. He is best known for his extensive travels and studies of ancient monuments and archaeological sites across Britain and Europe.