There is a reference to this barrow and the adjacent one in the Anglo-Saxon charters. In ‘Berkshire Barrows’ by ‘L.V. Grinsell’ (Berkshire Archaeological Journal vol 42 part 2 – 1938) it is listed as:
Hafoces Hlaew and Hundes Hlaew Mr O G S Crawford (note on OS map at Southampton) thinks these may be Idlebush barrow and the disc barrow to South, on 19 N.W.
Hafoc is A-S for ‘Hawk’ and Hundes is probably A-S for ‘Dog or Hound’. Many bronze age barrows in the area are named by Anglo-Saxons after animals or people from their own mythology (i.e. Waylands Smithy).