The origin of this name is still today quite uncertain. The theories include: 1) From two Ancient Germanic elements: “*īsarną” (iron) plus “*badwo” (battle, fight). 2) From two Ancient Germanic elements: “*īsarną” (iron) plus “*berhtaz” (light, bright, clear, shining one). Isembard (also spelled Isembart or Isembert) was a Burgundian nobleman and count of Autun. According to the Annales Fontanellenses, his father was Warin of Provence.