Baby girl name

Nataleigh
I'm not pregnant (yet) but already have 2 names & middle names picked out for each gender, me & my partner agree on all except one.
We both really like the name Frankie for a girl, I know it's not everyone's cup of tea but we love it, the problem is I keep thinking she should have something to fall back on? maybe register her Francesca with nick name Frankie? partner disagrees & feels Frankie is fine as it is.
I just think people may be expecting to meet a male when they see the name Frankie? 
What do you all think? 

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