Any ideas that would flow well? I love [name]Cleo[/name], but with our last name it sounds like cleopatra 
[name]Petra[/name]
[name]Lyra[/name]
[name]Cassia[/name]
[name]Calla[/name]
[name]Agnes[/name]
[name]Hero[/name]
[name]Echo[/name]
[name]Lotus[/name]
[name]Rena[/name]
[name]Tessa[/name]
[name]Zeta[/name]
[name]Xanthe[/name]
[name]Phoebe[/name]
[name]Fiona[/name]
[name]Maeve[/name]
[name]Tess[/name]
[name]Piper[/name]
[name]Violet[/name]
[name]Eden[/name]
[name]Alice[/name]
[name]Cora[/name]
[name]Clara[/name]/[name]Claire[/name]
[name]Hazel[/name]
[name]Jade[/name]
[name]Camille[/name]
Since you have a brilliant floral theme, why not stick to that?
[name]Juniper[/name]
[name]Laurel[/name]
[name]Violet[/name]
[name]Daisy[/name]
[name]Calla[/name]
[name]Lily[/name]
[name]Rose[/name] (and variations of [name]Rose[/name] like [name]Rosalie[/name], [name]Rosalind[/name], [name]Rosamund[/name], etc.)
[name]Poppy[/name]
[name]Azalea[/name]
[name]Acacia[/name]
[name]Flora[/name]
[name]Dahlia[/name]
[name]Pansy[/name]
[name]Ivy[/name]
[name]Amaryllis[/name]
[name]Petunia[/name]
Personally, with [name]Daphne[/name] and [name]Iris[/name], I like [name]Laurel[/name], [name]Calla[/name] and [name]Dahlia[/name] best!
[name]Daphne[/name] and [name]Iris[/name] are gorgeous. [name]Shame[/name] about [name]Cleo[/name]!
I love the suggestions of [name]Lyra[/name], [name]Hazel[/name], [name]Violet[/name], [name]Calla[/name], [name]Flora[/name], [name]Fiona[/name] & [name]Juniper[/name]. And I’ll add:
[name]Freya[/name]
[name]Willa[/name]
[name]Olive[/name]
[name]Astrid[/name]
[name]Luna[/name]
[name]Hermione[/name]
[name]Penelope[/name]
[name]Etta[/name]
[name]Fleur[/name]
[name]Juno[/name]
[name]Jemima[/name]
[name]Esme[/name]
[name]Cecily[/name]
[name]Jessamine[/name]
[name]India[/name]
[name]Celeste[/name]
[name]Stella[/name]
[name]Lola[/name]
[name]Cosima[/name]
[name]Eve[/name]
[name]Ramona[/name]
[name]Orla[/name]
[name]Sylvie[/name]
[name]Lydia[/name]
Good luck!
Seem [name]Daphne[/name] and [name]Iris[/name] are unique but not obscure I’d suggest a similar name for their sister. If you like the floral theme then [name]Violet[/name] or [name]Willow[/name] would be nice (also 2 syllables like the others). If you don’t want to continue the theme then other pretty names that remind me of [name]Daphne[/name] or [name]Iris[/name] are [name]Lola[/name], [name]Isabelle[/name], [name]Zara[/name], [name]Eva[/name], [name]Sahara[/name], [name]Sophia[/name] etc. Good luck!
Others in the floral category would be:
[name]Anthea[/name]
[name]Jasmine[/name]
[name]Marguerite[/name] (in its “daisy” manifestation)
[name]Daphne[/name], [name]Iris[/name] and sister…
[name]Juno[/name]
[name]Rosamund[/name]
[name]Eliza[/name]
[name]Adele[/name]
[name]Twila[/name] / [name]Twyla[/name]
[name]Camille[/name]
[name]Aurora[/name]
[name]Petra[/name]
[name]Cassandra[/name]
[name]Sybil[/name]
[name]Alethea[/name]
Casilda
[name]Elora[/name]
[name]Esther[/name]
[name]Pearl[/name]
[name]Bettina[/name]
[name]Margot[/name]
[name]Electra[/name]
[name]Arwen[/name]
[name]Lyra[/name]
[name]Dahlia[/name]
[name]Junia[/name]
[name]Jemima[/name]
[name]Rowena[/name]
[name]Estella[/name]
[name]Odessa[/name]
[name]Ardith[/name]
[name]Georgiana[/name]
[name]Florence[/name]
[name]Alma[/name]
[name]Celeste[/name]
[name]Freya[/name]
[name]Beatrix[/name]
[name]Candida[/name]
[name]Maia[/name]
[name]Thalia[/name]
[name]Eudora[/name]
[name]Galilea[/name]
[name]Samara[/name]
[name]Thisbe[/name]
[name]Sabrina[/name]
[name]Bridget[/name]
[name]Jocasta[/name]
[name]Sylvia[/name]
[name]Rhea[/name]
[name]Isadora[/name]
[name]Clara[/name]
[name]Carlotta[/name]
[name]Antonia[/name]
[name]Mabel[/name]
[name]Giselle[/name]
[name]Perdita[/name]
[name]Hazel[/name]
[name]Clover[/name]
[name]Arabella[/name] / [name]Araminta[/name]
[name]Emerald[/name]
[name]Corinne[/name]
[name]Esme[/name]
[name]Flora[/name] / [name]Fleur[/name]
[name]Gemma[/name]
[name]Geneva[/name] / [name]Ginevra[/name]
[name]Cecily[/name]
[name]Helena[/name]
[name]Juliet[/name]
[name]Mariel[/name]
[name]Simone[/name]
[name]Marina[/name]
[name]Lydia[/name]
[name]Mirabel[/name]
[name]Cordelia[/name]
[name]Veronica[/name]
[name]Melania[/name]
[name]Verbena[/name]
[name]Justina[/name]
[name]Aurelia[/name]
[name]Opal[/name]
[name]Greta[/name]
[name]Allegra[/name]
[name]Eloise[/name]
[name]Frida[/name]
[name]Linnea[/name]
[name]Rosemary[/name]
[name]Theodora[/name]
[name]Rhea[/name]
[name]Saskia[/name]
[name]Hyacinth[/name]
[name]Celia[/name]
[name]Viola[/name] / [name]Violet[/name]
[name]Ophelia[/name]
[name]Paloma[/name]
[name]Felicity[/name]
[name]Susanna[/name]
[name]Lilith[/name]
[name]Lida[/name]
[name]Tatiana[/name]
[name]Xanthe[/name]
[name]Lucia[/name]
[name]Laurel[/name]
[name]Ramona[/name]
[name]Jessamine[/name]
[name]Valentine[/name]
I very much like the pp’s suggestions of [name]Laurel[/name] and [name]Jessamine[/name].
rollo 
When I see [name]Daphne[/name] and [name]Iris[/name] I think of Greek ([name]Iris[/name] is what we are naming this baby, btw :))
So here are some Greek names that I like and think go well:
[name]Agatha[/name]
[name]Helena[/name] / [name]Helene[/name]
[name]Roxana[/name] / [name]Roxane[/name]
[name]Ianthe[/name]
[name]Pandora[/name]
[name]Penelope[/name]
[name]Selena[/name] / [name]Selene[/name]
[name]Rhea[/name]
I like violet, but when you would introduce them as this is violet and iris, it kind of makes me think of the word virus, eek! Does anyone else get that image? hmmm, I really do like the subtle flower theme you have going. I think a variation of [name]Rose[/name] would work, like [name]Rosemary[/name] or [name]Rosalie[/name]. That would be my pick!
Your two daugthers have such wonderful names! They are both just so feminine and beautiful.
I also [name]LOVE[/name] [name]Mirabel[/name], very feminine as well.
Other great names:
[name]Elodie[/name]
[name]Juliet[/name] (ahh so romantic)
[name]Grier[/name]
[name]Brielle[/name]
[name]Estella[/name]
[name]Gemma[/name]
[name]Bridget[/name] (think glamorous [name]Bardot[/name], not [name]Jones[/name]!)
I would stay away from floral names unless is sutble like [name]Daphne[/name]. With [name]Iris[/name] as a sister it would be too cute. Something like [name]Briar[/name] or [name]Rosalind[/name] would be ok but [name]Violet[/name] or [name]Willow[/name] would be too much.
cheers,
BethAshley
What about [name]Eloise[/name]? It has been a fav name of mine recently ;). If you went with a non floral name, which might be best as to not seem to cutsey, I would definitely pair it with a flower middle or even a gem middle name. My fav pairing is [name]Eloise[/name] [name]Ruby[/name] and I think that would work with your sib set if you liked it!