Being an Aussie its part of our culture to give close to pointless nicknames. If the name is slightly long and requires a slight amount effort to pronounce it correctly it's just not cricket to say the real name. Even when the name is short and easy to say we still have to change it to something more acceptable like Bruce into brucey.
Anything that's short and starts with ch just makes it more fun to down play the lethalness that about to befall an unwitting ship that has found its self at range 1 of an exposed target locked chirpy ![]()