I have 4 girls (including twins) and - probably - another one the way in 4 weeks time.
We used Elizabeth and Isabella for our identical twins and shortened them quite quickly to Betsie and Bella (both of these suit them to a tee!) to avoid Izzy and Lizzy (especially as Bella is a real fairy and would have ended up as Dizzy Izzy!). Betsie was most uncommon about 8 years ago but not so much now. Still, they sound really cute together.
Then we had Anastasia Rose and Betsie insisted on using 'Rosie' so she's ended up as 'Anna-Rosie' - hopefully she'll use something like 'Asia-Rose' or just 'Asia' as she gets older as it's more sophisticated.
Then, in memory of my Nan, we had Margarita and she gets called Meggy/Meg as my Nan was Peggy (for reasons even she didn't know!)
We haven't a clue about this one but are toying with Vivienna, shortened to Vivi. We like Julienna but hate Jules, love Francesca but hate Frankie, love Angelia but hate Angie. I like Aurelia but what the hell can that be shortened to?
We've half-considered boys names as we're not convinced it's a boy: William (but hate Will), Edward (but not Ed/Eddie). I think it will be Jonas (my husband is John but won't have Jonathan) but I'd hate it to be shortened to Jo.
Just too many kids!!!!
WE NEED nicknames in our house: just try shouting their full names at tea time! I'd need 5 minutes just yelling!