The name Christain has its origins in the Late Greek name Christianos, which was derived from the Greek word Christos, meaning "the anointed one". This name was given to the early followers of Jesus Christ, who was believed to be the Messiah or the anointed one. The name Christianos first appears in the New Testament of the Bible, specifically in the Acts of the Apostles, where it is mentioned that the disciples of Jesus were first called Christians in Antioch.

The name Christain gained widespread popularity after the spread of Christianity throughout the Roman Empire and beyond. It was adopted as a personal name by many early Christians as a way to express their faith and devotion to Christ. In the early centuries of Christianity, the name Christain was often associated with martyrs and saints who sacrificed their lives for their beliefs.

One of the earliest recorded examples of the name Christain is Saint Christain of Alexandria, who lived in the 3rd century AD and was martyred for his faith during the persecution of Christians under the Roman emperor Decius. Another notable early bearer of the name was Christain of Prum, a Benedictine monk and hagiographer who lived in the 8th century and wrote biographies of saints.

Throughout history, the name Christain has been borne by various notable figures, including Christain IV (1577-1648), the King of Denmark and Norway, who is credited with establishing Danish colonial holdings in India and the West Indies. Christain Huygens (1629-1695) was a Dutch mathematician, astronomer, and physicist, best known for his contributions to the development of the pendulum clock and the discovery of Saturn's moon Titan.

Christain Dior (1905-1957) was a French fashion designer who founded the iconic fashion house Dior and revolutionized the world of haute couture with his "New Look" style. Christain Barnard (1922-2001) was a South African cardiac surgeon who performed the world's first successful human-to-human heart transplant in 1967, paving the way for advancements in organ transplantation.

Christain Bale (born 1974) is a British actor known for his versatile performances in films such as "The Machinist", "The Prestige", and his portrayal of Batman in Christopher Nolan's "The Dark Knight" trilogy.