'Knightsbridge' means the bridge of the young men.
Old English cniht meant a young man or servant, not yet a mounted warrior, and bridges seem to have been favourite gathering places for the young. This one carried an old road west over the River Westbourne. The name was recorded as Cnihtebricge in about 1050. It may also refer to the limits of the jurisdiction of London's cnihtengild, a guild of cnihtas.