Love: Opal, Cleo, Isis, Fern and June.
Dislike: Iris, Harriet, Remy, Pearl, Quinn.
And I'd avoid Clara since you already have a Nora. I also don't think that an -s name with an S- surname would flow well. Definitely try them all with your surname.
Opal Isis Juliet
Mia Margaret Fern
Cleo June Adelaide
Thank you ALL for such FABULOUS feedback! There are some fabulous combinations out there
I've narrowed it down to (and received approval from DH for)
Ines Evelyn Pearl
Ines Clementine Nell
Harriet Adelaide Eve
Iris Juliet ???
Although of course, I'll probably keep making lists and revising this until the baby is born.
@wattle, I loved your description of Ines having exotic flair. It is pretty perfect for us, as DH is South American and half the family speaks Spanish. Thank you for pointing out that you know five Mia's under 7. From your suggestions I love Frida, Romy and Winifred. I think Romy may be a better option than Remy.
@jessicalucy, I loved your suggestions of Beatrix, Indigo and Willow.