Dear All, The above link is a good one into the Niddrie Family in the 1800s.  The few Niddries that I have are from an earlier period around Hill of Craigo, Logie Pert.  William Niddrie  1759 - 1837 married to Jean Lakie 1772 - 1835.  They had two daughters so that Niddrie line does not go forward.  However, Robert Niddrie b 17xx & Jean Milne had another son called James Niddrie b 28 Jun 1769 so there could be a line from there.  Anyway the two lines may not connect after you do the tracing back from where you are.
Good luck with the hunt,  nw_whiskers