We’ve decided on [name]Iris[/name] or [name]Hazel[/name], but we aren’t sure about middle names for them. I’ve been thinking [name]Tara[/name], [name]Carol[/name], [name]Cara[/name], [name]Caroline[/name], [name]Elizabeth[/name] or [name]Grace[/name], but I’m not sold on any of them.
What about:
[name]Mara[/name]
[name]June[/name]
[name]Melody[/name]
[name]Eleanor[/name]
[name]Emma[/name]
[name]Bianca[/name]
[name]Madeline[/name]
[name]Alice[/name]
[name]Charlotte[/name]
Any family names you would consider in the middle name slot?
[name]Hazel[/name] [name]Irene[/name]?
As [name]Iris[/name] and [name]Hazel[/name] are quite short and snappy, I’d go with something similarly traditional and elegant, but longer, for a middle name.
[name]Iris[/name] [name]Elizabeth[/name]
[name]Iris[/name] [name]Eleanor[/name]
[name]Iris[/name] [name]Adeline[/name]
[name]Iris[/name] [name]Antonia[/name]
[name]Hazel[/name] [name]Caroline[/name]
[name]Hazel[/name] [name]Georgina[/name]
[name]Hazel[/name] [name]Beatrice[/name]
[name]Hazel[/name] [name]Josephine[/name]
I really like [name]Mara[/name]. Maybe [name]Hazel[/name] [name]Mara[/name]?
I really hope you choose [name]Iris[/name]! So lovely. [name]How[/name] about:
[name]Iris[/name] [name]Caroline[/name]
[name]Iris[/name] [name]Catherine[/name]
[name]Iris[/name] [name]Jane[/name]
[name]Iris[/name] [name]Amelia[/name]
[name]Iris[/name] [name]Camille[/name]
[name]Iris[/name] [name]Clementine[/name]
[name]Iris[/name] [name]Cordelia[/name]
With [name]Iris[/name] or [name]Hazel[/name], I’d avoid another flower or even word name. Here’s what I’d consider
[name]Adrienne[/name]
[name]Annabel[/name]
[name]Beatrice[/name]
[name]Catalina[/name]
[name]Clarissa[/name]
[name]Meredith[/name]
[name]Natalya[/name]
[name]Tabitha[/name]
[name]Virginia[/name]
The names I listed in the original post are family names or names similar to them.
[name]Both[/name] [name]Hazel[/name] and [name]Iris[/name] are gorgeous names. [name]How[/name] can you choose? 
[name]Hazel[/name] [name]Carolina[/name] ([name]Caroline[/name] is nice too, but this flows a little better to my ear)
[name]Hazel[/name] [name]Bethany[/name]
[name]Hazel[/name] [name]Colette[/name]
[name]Hazel[/name] [name]Penelope[/name]
[name]Iris[/name] [name]Annabel[/name]
[name]Iris[/name] [name]Aurelia[/name]
[name]Iris[/name] [name]Ramona[/name]
[name]Iris[/name] [name]Valentine[/name]
Since either of them will be two syllables, I’d choose either a three or one syllable middle name to balance things out. I’m also curious how many syllables are in the last name and what initial it starts with so that the initials wouldn’t spell anything.
Last name is 4 syllables and starts with a “G” that makes a “J” sound. It ends in an “N”. I definitely can’t use an A-name or O-name with [name]Hazel[/name].
[name]Hazel[/name] [name]Mara[/name] is really pretty!