The name Adelle has its origins in the French language and can be traced back to the Middle Ages. It is a feminine form of the masculine name Adel, which is derived from the Germanic word "adal," meaning "noble" or "aristocratic." The name gained popularity in France during the medieval period and was often given to girls born into noble or aristocratic families.

One of the earliest recorded instances of the name Adelle can be found in the chronicles of the Merovingian dynasty, which ruled over the Franks from the 5th to the 8th century. The name was borne by Adelle of Aquitaine, a Frankish noblewoman who lived in the 7th century and was known for her piety and charitable works.

In the 12th century, the name appears in the writings of the renowned French poet and troubadour, Bertran de Born. He composed a poem dedicated to a lady named Adelle, whom he praised for her beauty and virtue. This literary reference helped to popularize the name among the French nobility of the time.

Another notable figure in history who bore the name Adelle was Adelle of Blois, a French countess who lived in the 11th century. She was the daughter of Odo II, Count of Blois, and played a significant role in the political affairs of her time.

In the 19th century, the name Adelle gained further recognition with the publication of the novel "The Count of Monte Cristo" by Alexandre Dumas. One of the characters in the novel, a young woman named Adelle Renée Danglars, was portrayed as a beautiful and virtuous woman, adding to the romantic appeal of the name.

Other notable individuals with the name Adelle include Adelle Staunton (1826-1898), an American actress and singer who performed in numerous theatrical productions in the 19th century, and Adelle Davis (1904-1974), an American author and nutritionist who wrote several influential books on healthy eating and nutrition.