Thank you so much for your insights; my 5th gr.grandfather was Rev.
William Johnston--the antithesis of Sir William Johnson.
Interestingly enough, his wife's maiden name was Cummins/Cummings--but I
see no connection (unless the one you mentioned was a brother/cousin).
My Johnston came from the Dublin area of Ireland (I think!), immigrated
into the Port of Boston, migrated (later) to NH, and finally to Delaware
County (Sidney, to be exact).
He was a Presbyterian minister, and found a lot of difficulty in Mass. &
NJ--was probably much more popular in Upstate NY.