The name Blain has its origins in the Old French language and can be traced back to the 12th century. It is believed to have derived from the Germanic word "blund," meaning "blond" or "fair-haired." This suggests that the name was initially used to describe someone with light-colored hair.

One of the earliest recorded instances of the name Blain can be found in the 12th-century epic poem "The Song of Roland," where it appears as a character's name. This French literary work is one of the oldest surviving examples of the Chansons de geste, a medieval narrative style that recounts the deeds of heroic figures.

In the 13th century, there are records of a Blain de Saint-Maur, who was a French nobleman and landowner. He is mentioned in various historical documents from that period, indicating the popularity of the name among the aristocracy.

During the Middle Ages, the name Blain was also associated with religious figures. One notable example is Blain, a 7th-century Frankish abbot and saint, who is venerated in parts of France and Belgium. His life and works were chronicled in hagiographies, contributing to the spread of the name among the faithful.

Throughout history, there have been several prominent individuals who bore the name Blain. One of the earliest was Blain de Brialmontiers (c. 1130-1200), a French knight who fought in the Third Crusade alongside Richard the Lionheart. Another notable figure was Blain de Vaux (c. 1175-1234), a French philosopher and theologian who made significant contributions to the Scholastic movement.

In the 16th century, Blain Pichon (1512-1580) was a French diplomat and writer who served as a secretary to King Henri II. A century later, Blain de Saint-Aubin (1617-1678) was a French clergyman and historian who wrote extensively about the religious orders of his time.

Moving into the 18th century, Blain François de Garsault (1721-1778) was a French military officer and author who published several influential works on horsemanship and equine management.

These are just a few examples of the many individuals throughout history who carried the name Blain, reflecting its enduring presence across various cultures and eras.