The name Shanna has its origins in the Irish language and culture. It is a variant of the name Siobhan, which is derived from the ancient Irish Gaelic word "siobhán," meaning "God's grace" or "born of life and fire." The name Shanna first emerged in Ireland during the medieval period, around the 12th or 13th century.

While the name Shanna does not have any direct references in ancient Irish texts or religious scriptures, its root word "siobhán" can be traced back to early Irish folklore and mythology. The name was likely inspired by the Celtic goddess of fire and fertility, known as Siobhan or Síbhín.

The earliest recorded examples of the name Shanna can be found in Irish historical records and genealogical records dating back to the 15th and 16th centuries. However, the name did not gain widespread popularity until much later, particularly in the 20th century.

One of the earliest notable individuals with the name Shanna was Shanna Caughey, an Irish painter and artist who lived in the late 18th century. Her works are preserved in various galleries and museums in Ireland.

Another famous Shanna was Shanna Kress, a French reality television personality and social media influencer, born in 1986. She gained popularity for her appearances on several French reality shows in the early 2010s.

In the literary world, Shanna Compton is an American poet and author, born in 1970. She is known for her collections of poetry, including "Brink" and "Gamers: Writers' Lives."

Shanna Zolman, born in 1984, is a former American professional basketball player who played in the WNBA for teams like the San Antonio Silver Stars and the Indiana Fever.

Lastly, Shanna Jacobson, born in 1975, is a Canadian actress best known for her roles in television shows like "Supernatural" and "Battlestar Galactica."