I don't remember the why behind these names, but as kids we had them. Ann was "Cookie," Louise was "Toosie," and I was "Poopsie." I don't remember whether Tom had one or not . . . I'll have to ask my siblings. I remember liking my nickname until one of my Canadian uncles thought it was "Poopy." I was soooo upset! I kept correcting him - "It's POOP-SSEEE!" No child wants to be called Poopy. That's just gross. I'll have to add to this entry once I've queried my older siblings about their memories on our nicknames.