Just in case you may not have checked - the 1901 Census lists 15 McNights searching on just the surname and Isle of Man as a keyword. I vaguely remember a butcher's shop in Duke Street, Douglas, under this name and just possibly a fellow school mate around 1939 / 40 at Murray's Road School, Douglas, named McNight.
Manx Genealogy Archive 1 is maintained by isleofman.com
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