Respondents: 19 (This poll is closed)
[name_f]Love[/name_f] [name_u]Arden[/name_u] and [name_f]Elinor[/name_f] together 
good luck and congratulations!
Nori/a or Ellie Blythe would be cute with Birdie Mae However, it will come to you organically
D’oh I just saw your kids’ names in your sig, which may have informed my decision otherwise… but [name_f]Estelle[/name_f] [name_f]Maris[/name_f] on its own is lovely. [name_f]Elinor[/name_f] [name_f]Blythe[/name_f] is also a nice combo, and I think [name_f]Elinor[/name_f] or [name_f]Gwyneth[/name_f] would fit in with your kids well. [name_f]Clarissa[/name_f] is the only name I don’t care for.
[name_m]Little[/name_m] [name_u]Arden[/name_u] is called [name_f]Birdie[/name_f] [name_f]Mae[/name_f]. Nicknames are funny things. Sometimes they appear out of nowhere and sometimes they come naturally. It would be nice for your second daughter to have a nn but it’s not going to be the end of the world if she doesn’t. However, all of your first names have wonderful nn potential. I’m going to list my top choices for each first name.
1 [name_f]Elinor[/name_f] [name_f]Blythe[/name_f] - this combo sounds like a writer’s name (a good thing :)). [name_f]Nell[/name_f] is my favourite nickname.
2 [name_f]Estelle[/name_f] [name_f]Maris[/name_f] - reminds me of [name_f]Stella[/name_f] [name_f]Maris[/name_f]. [name_f]Elle[/name_f] or [name_f]Essie[/name_f] would both be lovely.
3 [name_f]Gwyneth[/name_f] [name_f]Rosalie[/name_f] - [name_f]Gwen[/name_f] is a wonderful nickname option.
4 [name_f]Clarissa[/name_f] [name_f]Blythe[/name_f] - this combo flows well. [name_u]Clare[/name_u], [name_u]Ari[/name_u] or [name_f]Clarrie[/name_f] would be your options here.
I love [name_f]Gwyneth[/name_f] [name_f]Estelle[/name_f], and think [name_f]Gwen[/name_f] would be the perfect sister for [name_f]Birdie[/name_f] [name_f]Mae[/name_f] [name_f]Elinor[/name_f] [name_f]Blythe[/name_f] would be my second choice, maybe called [name_f]Nellie[/name_f] [name_f]Blythe[/name_f]?