The name Donavan originated from the Celtic and Gaelic languages, with its roots tracing back to ancient Ireland and Scotland. The name is derived from the word "donndubhan," which means "brown-haired chief" or "dark-haired leader." This suggests that the name was initially given to those who held positions of authority or leadership in Celtic communities.

In the early Middle Ages, variants of the name, such as Donovan and Donaghue, began to appear in historical records and manuscripts. One of the earliest known references can be found in the Annals of Inisfallen, a chronicle of medieval Irish history, which mentions a King Donnubhan who ruled over a region of Ireland in the 7th century.

As Christianity spread throughout Ireland and Scotland, the name became associated with various saints and religious figures. One notable example is Saint Donovan, an Irish monk who lived in the 6th century and established a monastery in County Wexford, Ireland.

Throughout the centuries, the name Donavan has been borne by numerous notable individuals. In the 12th century, Donovan O'Brien was a powerful Irish king who ruled over Thomond (present-day County Clare) and played a significant role in the Norman invasion of Ireland.

During the Renaissance period, Donovan Arundell (1473-1546) was an English Catholic priest and one of the leading scholars of his time, known for his contributions to theology and philosophy.

In more recent history, Donavan Brazier (born 1997) is an American middle-distance runner who won the gold medal in the 800 meters at the 2019 World Athletics Championships.

Donavan Dilon (1935-2007) was a renowned American actor and filmmaker, best known for his roles in iconic films like "Chinatown" and "The Godfather Part II."

Another notable figure is Donavan Freberg (1926-2020), an American author, voice actor, and satirist who worked on various television shows and commercials throughout his career.

These examples showcase the enduring presence and diverse backgrounds of individuals who have carried the name Donavan throughout history, reflecting its Celtic origins and its journey across different cultures and time periods.