Which preposition to use with harrovians

of Occurrences 1%

On July 15, 1888, being the first day of the Eton and Harrow Match at Lord's, a few old Harrovians of different generations met at a Harrow dinner.

with Occurrences 1%

After a considerable interval, Mr. ARNOLD LUNN has followed The Harrovians with another school story, Loose Ends (HUTCHINSON).

Which preposition to use with  harrovians