I think this is such a good nn for
Charlotte! Way underused and soo much nicer than
Charlie.
Only problem is I don't like the flow of
Charlotte Juliet - I think the t sounds at the end of each name clash.
And no I don't think there will be any R+J jokes - esp if its just a middle name. I don't even think it would be an issue if it were a first name.
I also like
Nell Juliet and
Matilda Juliet -
Josephine Juliet doesn't flow as well, but I love the nn
Josie.