I have a Francesca who is always known as Frankie, so really I'm looking for something that goes nicely with Frankie.
I really like Penny but DP has vetoed it because Frankie and Penny sounds like Frankie and Benny's! 
But I feel like Frankie and Penny have a similar vibe as names.
I don't love anything else, but am considering:
Elsie (Elisabeth)
Josie/Joey (Josephine)
Georgie/Jorgie (Georgina)
Margot
I also love Beatrice/Bea, Madeleine/Maddie and Matilda/Mattie but DP says no. I like Isabella but can't use it for family reasons.
I'd love some suggestions for good names to go with Frankie. We're at the 11th hour now and still stuck.