Go on then, do your worst...just don't insult the second name 
Which do you prefer and why? Does one combination sound better than the other?
Charlotte Joanna
Athena Joanna
Chloë Joanna
Artemis Joanna
Nathalie Joanna
DH has vetoed one of them, won't tell you which. But then his favourite names are Sandra and Lena which I have vetoed! Our surname begins with "S" so let me know if it spells something I haven't noticed. DS is called Alexander (usually called Alex, but I call him Xander)
I prefer the Greek spelling of Khloë and Athene, but think maybe they're a bit too unusual.
Of course, it might all be immaterial as we don't know yet if it's a boy or a girl...