Origin of umbri
- Also called Ombrii in some Roman sources. Many Roman writers thought the Umbri to be Celtic; Cornelius Bocchus wrote that they descended from an ancient Gaulish tribe. Plutarch wrote that the name might be a different way of writing the name of the Celtic tribe Ambrones. He also suggested that the Insubres, another Gaulish tribe, might be connected; their Celtic name Isombres could possibly mean "Lower Umbrians," or inhabitants of the country below Umbria.