"Hank" is an apparently American nickname for someone whose given name is "Henry". Thus, the famous baseball player, Henry Aaron, is better known as "Hank Aaron". Now you mention your unfamiliarity with "Hank", I am not sure that they use it as a nickname in Oz, either. By the way, there is nothing pejorative about it. Henry/Hank is probably off somewhere with a pint of Foster's, ever since Adam Scott won the Masters. One of my Australian friends emailed to me that he was in tears over this victory, the first for an Aussie.