Thank you. John Denning, being both a single entry plus the small number of family with that spelling (there are other possibilities), may well be the one. I need to locate stronger proof that they are one and the same.
Mary McGillick was also called Margaret McGillick, possibly even Mary Margaret or Margaret Mary.
John McDonnell, with four entries is particularly intriguing. I have found two lessees for property in Larah South (DED). Larah South and Waterloo DEDs are the focus of my search.
I appreciate your response and welcome any other information you might locate.