NIDDRIE, a surname, meaning king’s champion, derived from two Gaelic words, Niadh, champion, and Ri or Rioch, king, and denoting that it was once the place of his residence. Niddry-Marshal, in the parish of Liberton, Mid Lothian, was so called from the Wauchopes, who, in ancient times, were guardians of part of the south borders of Scotland (see WAUCHOPE, surname of,) and to distinguish it from Longuiddry in East Lothian, and Niddry Seton, Linlithgowshire.