The name Siobhan has its origins in the Irish language, derived from the medieval Gaelic name Sibhán. This name traces its roots back to the Old Irish word "siav," which means "fairy" or "elf." The name gained popularity during the Middle Ages in Ireland, particularly among the Gaelic nobility and ruling classes.

Siobhan is a feminine given name, often considered the Irish equivalent of the English name Joan or the French name Jeanne. The name's spelling has evolved over time, with variations such as Síobhán, Siubhan, and Sioban appearing in historical records.

One of the earliest recorded instances of the name Siobhan can be found in the Annals of the Four Masters, a chronicle of medieval Irish history compiled in the 17th century. The annals mention a woman named Siobhan who lived in the 12th century and was the daughter of a prominent Irish chieftain.

Throughout history, several notable individuals have borne the name Siobhan. One of the most famous was Siobhan McKenna (1923-1986), an Irish stage and film actress renowned for her performances in productions of classic Irish plays. Another notable Siobhan was Siobhan Donohue (1960-2012), an Irish singer and songwriter who achieved chart success in the 1990s.

In the realm of literature, Siobhan Dowd (1960-2007) was a celebrated Irish author who wrote several award-winning books for children and young adults. Her novel "A Swift Pure Cry" won the Carnegie Medal in 2007, one of the highest honors in children's literature.

The name Siobhan has also been associated with historical figures in Irish mythology and folklore. In the Irish legend of the Children of Lir, one of the central characters is a princess named Siobhan, who is transformed into a swan along with her siblings by their jealous stepmother.

Another notable bearer of the name was Siobhan Fitzpatrick (1914-1998), an Irish-American actress and singer who performed on Broadway and in Hollywood films throughout the mid-20th century.

While the name Siobhan has its roots in Irish culture, it has gained international recognition and popularity in recent decades, transcending its origins and becoming a name embraced by families around the world.