The name is of Celtic origin, and means "broad stream".[1]
In the Middle Ages, the Leadon flowed in two branches for the last two miles. The main stream, known as the New Leadon, flowed south of Over to join the river south of Over Bridge. The river was prone to flooding, and to alleviate the problem the river was diverted in 1867 to flow along the branch previously known as the Old Leadon, and now the only course of the river, flowing into the Severn north of Over.[4]