Current translation for Hamstreet And Orlestone
  ham derived from hamm - Denotes a piece of land surrounded with paling, wicker-work, etc., and so defended against water, which would otherwise wash it away, so a valley settlement.
  street derived from via strata - originally from the latin via strata(high paved road) -Old English stret (Mercian, Kentish), stræt (West Saxon)
  and derived from ond - also
  orle derived from orildu/horh - very old / clammy air - foggy
  stone derived from stenen - stoney - probably a roman road milestone or builders stone or seat of power
Place name translation provided by saxonhistory.co.uk