We have a daughter named Elizabeth. When we brought her home from the hospital, I just happened to call Bibby in a nickname kind of way, but my mother-in-law thought it was her actual nickname and exclaimed it was adorable, so we started calling her that as well. I ended up kind of liking it and eventually it grew into Biba, which she happily goes by now. I really want to do something similar for her sibling, a traditional name with a slightly more unique nickname; so they get the best of both worlds when it comes to names.
Although, my husband doesn't want anything too posh, (I'll be honest, I'm American who moved here for work then got married and my daughter is still young, so I still have no concept of what is "posh" or not in terms of names).
Let me know any unique nickname names you guys have! For either gender!