harry is a good shortened name
There's also Hal.
Harold Robbins's birth name is Harold Rubin.
Harold Meade's birth name is Harold Meadmore.
Harold Diamond's birth name is Harold Roth.
Harold Faltermeyer's birth name is Harold Faltermeier.
Harold Hubert's birth name is Bourke, Harold.
Harold Gordon's birth name is Harold Goldstein.
Harold Ramis's birth name is Harold Allen Ramis.
Harold Courlander's birth name is Harold Aaron Courlander.
Harold Snoad's birth name is Harold Edward Snoad.
Harold Sanford's birth name is Harold Bryant Sanford.
Harold Shipman's birth name is Harold Frederick Shipman.
Harold Shumate's birth name is Harold Miller Shumate.