Holbrook (from Ancestry.com)
English: habitation name from any of various places, for example in Derbys, Dorset, and Suffolk, so called from Old English - hol (hollow, sunken) + broc (stream - see Brook). The name has probably absorbed the Du. van Hoobroek, found in London in the early 17th cent., and possibly a similar Low Ger. surname; several American bearers of the name in the 1880 census give their place of birth as Oldenburg or Hanover, Germany.