I think Chrisanthy
Joyce sounds nice with the siblings. It is definitely different and far more obscure than the other names. But I think Chrisanthy is one of those "blank-slate" names, particularly because it's an alternative spelling. I think if you used the classical spelling (
Chrysanthe) instead it wouldn't go with the siblings as nicely.
perhaps...
Arianthy
Erianthy
Calanthy
Evanthy
Ianthy
Melanthy
Marianthy
Mellisanthy
Mirianthy
Or perhaps...
Chrisanth
Chrisantha
ॐ मणिपद्मे हूं
"Speak the truth; yield not to anger; when asked, give even if you only have a little."
"Live alone and do no evil; be carefree like an elephant in the elephant forest."