Current translation for Sissinghurst
  sissinghurst derived from mylkehouse street - renamed in the 19th century
mylke derived from mylc - milk
house derived from hus - dwelling, shelter, house - from Proto-Germanic *husan
street derived from via strata - originally from the latin via strata(high paved road) -Old English stret (Mercian, Kentish), stræt (West Saxon)
Place name translation provided by saxonhistory.co.uk