It’s pronounced “harry”
According to my many years in research of this subject; as I understand it, A Harry is someone who wears white socks with dress slacks and who pronounces “Moshe” as “Moe-sheh” It has to be a combination of the two. I sometimes wear white socks with dress slacks but I say “Moshe” so I am officially disqualified. (sorry if this upsets anyone but hey, I didn’t set the rules)