The name Raine is believed to have its origins in the Old English language, derived from the word "regn," which means "rain." It was initially used as a surname, but over time, it transitioned into a gender-neutral given name.

During the Anglo-Saxon period in Britain, which lasted from the 5th to the 11th century, the name Raine was commonly used as a surname. It often referred to someone who lived near a rainy or wet area, or perhaps someone who had a fascination with the rain.

One of the earliest recorded instances of the name Raine can be found in the Domesday Book, a comprehensive survey of landowners and properties in England, commissioned by William the Conqueror in 1086. The name appears as "Regen," which was likely the Old English spelling of the name at the time.

In the 12th century, the name Raine gained popularity as a given name, particularly among the nobility and aristocracy. One notable historical figure who bore this name was Raine of Rhuddlan, a Welsh noblewoman who lived in the late 12th century and was known for her involvement in the Welsh resistance against English rule.

In the 16th century, the name Raine was occasionally used as a masculine given name, although it remained relatively uncommon. One example is Raine Willughby, an English botanist and ornithologist who lived from 1635 to 1672 and made significant contributions to the study of birds and plants.

During the 19th century, the name Raine saw a resurgence in popularity, particularly in literary circles. One notable bearer of the name was Raine Maria Rilke, a renowned Austrian poet and novelist who lived from 1875 to 1926 and is considered one of the most influential figures in modern literature.

Another famous individual with the name Raine was Raine Spencer, Countess Spencer, an English aristocrat and the mother of Diana, Princess of Wales. She lived from 1929 to 2008 and was known for her philanthropy and her close relationship with her daughter.

In more recent times, the name Raine has been embraced as a gender-neutral given name, reflecting the growing acceptance of non-traditional names in many cultures. One notable modern figure with this name is Raine Maida, a Canadian singer-songwriter and the lead vocalist of the band Our Lady Peace, born in 1970.