We are struggling to agree on a sister name to our daughter [name_u]Charlie[/name_u] [name_f]Mae[/name_f]. We did agree on [name_u]Gene[/name_u] as middle name to honor my father. A couple ideas we had:
Nora [name_u]Gene[/name_u]
[name_f]Chloe[/name_f] [name_u]Gene[/name_u]
[name_f]Emma[/name_f] [name_u]Gene[/name_u]
[name_f]Samantha[/name_f] “[name_u]Sam[/name_u]/Sammie” [name_u]Gene[/name_u]
Any suggestions or opinions are appreciated!!
I love [name_f]Samantha[/name_f] “[name_u]Sami[/name_u]/Sammie” [name_u]Gene[/name_u]!!
I think it goes wonderfully with [name_u]Charlie[/name_u] [name_f]Mae[/name_f]! (It is also the name of one of my favorite characters on Days of Our Lives! 
so BONUS in my opinion!)
Ha I didn’t know of that character! Thanks for the input 
Samantha & [name_f]Chloe[/name_f] [name_u]Gene[/name_u] are my favorites on your list
Others
Francesca “[name_u]Frankie[/name_u]” [name_u]Gene[/name_u]
[name_f]Michaela[/name_f] [name_u]Gene[/name_u] “[name_u]Max[/name_u]” “[name_u]Mack[/name_u]”
[name_f]Jocelyn[/name_f] [name_u]Gene[/name_u] “[name_u]Joey[/name_u]” “[name_u]Josie[/name_u]”
[name_f]Lorelei[/name_f] [name_u]Gene[/name_u] “[name_u]Rory[/name_u]”
[name_u]Aspen[/name_u] [name_u]Gene[/name_u]
[name_f]Leona[/name_f] [name_u]Gene[/name_u]
[name_f]Maren[/name_f] [name_u]Gene[/name_u]
[name_f]Veronica[/name_f] [name_u]Gene[/name_u] “[name_f]Vera[/name_f]”
[name_u]Tatum[/name_u] [name_u]Gene[/name_u]
[name_f]Tamsin[/name_f] [name_u]Gene[/name_u]
[name_f]Talia[/name_f] [name_u]Gene[/name_u]
[name_f]Farrah[/name_f] [name_u]Gene[/name_u]
[name_f]Freida[/name_f] [name_u]Gene[/name_u]
[name_f]Freya[/name_f] [name_u]Gene[/name_u]
[name_u]Remi[/name_u]/Remington [name_u]Gene[/name_u]
[name_f]Gemma[/name_f] [name_u]Gene[/name_u] “[name_f]Gigi[/name_f]”
[name_f]Isis[/name_f] [name_u]Gene[/name_u] “[name_m]Iggy[/name_m]”
[name_f]Daphne[/name_f] [name_u]Gene[/name_u]
[name_f]Dahlia[/name_f] [name_u]Gene[/name_u]
[name_f]Lydia[/name_f] [name_u]Gene[/name_u]
[name_u]Ruby[/name_u] [name_u]Gene[/name_u]
[name_u]Bailey[/name_u] [name_u]Gene[/name_u]
[name_f]Delia[/name_f] [name_u]Gene[/name_u]
[name_f]Raquel[/name_f] [name_u]Gene[/name_u] “[name_u]Reggie[/name_u]”
[name_u]Piper[/name_u] [name_u]Gene[/name_u] “[name_u]Pepper[/name_u]”
[name_f]Ramona[/name_f] [name_u]Gene[/name_u] “[name_u]Romy[/name_u]”
[name_f]Estelle[/name_f] [name_u]Gene[/name_u] “[name_u]Stevie[/name_u]” “[name_f]Stella[/name_f]”
[name_u]Teagan[/name_u] [name_u]Gene[/name_u]
[name_f]Georgia[/name_f] [name_u]Gene[/name_u] “[name_f]Gigi[/name_f]” “[name_f]Gia[/name_f]”
[name_f]Sienna[/name_f] [name_u]Gene[/name_u]
Charlie [name_f]Mae[/name_f] & [name_f]Chloe[/name_f] [name_u]Gene[/name_u] 
Chloe [name_u]Gene[/name_u] is my favorite!!
I love [name_u]Charlie[/name_u] [name_f]Mae[/name_f] , and the names you have picked out match so well!
Nora [name_u]Gene[/name_u] is so cute and feels timeless and elegant
Others I would add are:
[name_f]Addie[/name_f] [name_u]Gene[/name_u]
[name_u]Payton[/name_u] [name_u]Gene[/name_u]
[name_u]Riley[/name_u] [name_u]Gene[/name_u]
[name_f]Cammie[/name_f] [name_u]Gene[/name_u]
[name_u]Taylor[/name_u] [name_u]Gene[/name_u]
[name_f]Olivia[/name_f] [name_u]Gene[/name_u]
Sammie [name_u]Gene[/name_u] goes perfectly with [name_u]Charlie[/name_u] [name_f]Mae[/name_f]!
I also love [name_u]Charlie[/name_u] [name_f]Mae[/name_f] & [name_f]Samantha[/name_f] “[name_u]Sammi[/name_u]” [name_u]Gene[/name_u]
Such a beautiful name choice 
Charlie [name_f]Mae[/name_f] is so perfect! For sister, I originally was going to suggest another unisex name. However, with mn [name_u]Gene[/name_u] already being unisex, I personally think her first name should be feminine. [name_u]Charlie[/name_u] & [name_f]Chloe[/name_f] is very sweet for sisters. These are my other suggestions:
Annie [name_u]Gene[/name_u]
[name_f]Emily[/name_f] [name_u]Gene[/name_u] “[name_f]Emmy[/name_f]”
[name_f]Catherine[/name_f] [name_u]Gene[/name_u] “[name_f]Cate[/name_f]”
[name_f]Margaret[/name_f] [name_u]Gene[/name_u] “[name_f]Maggie[/name_f]”
[name_f]Elizabeth[/name_f] [name_u]Gene[/name_u] “[name_f]Ellie[/name_f]” “[name_f]Libby[/name_f]”
[name_f]Molly[/name_f] [name_u]Gene[/name_u]
Genevieve (to honor [name_u]Gene[/name_u]). “[name_f]Evie[/name_f]” & [name_u]Charlie[/name_u] is just perfect!
Charlie is a nn that also works good as a first name standalone, I think going for another nn would create a wonderful theme but also like a short and sweet name to go with [name_u]Charlie[/name_u] too, my suggestions are:
Charlie [name_f]Mae[/name_f] and [name_f]Ella[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Zinnia[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Lila[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Mavis[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Sandra[/name_f] [name_u]Gene[/name_u]
I think in general and especially when making combos both names go well together because of the consistent middle! I think any name would work it just about finding a great name that flows for you,
nn names:
Charlie [name_f]Mae[/name_f] and [name_f]Addie[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Millie[/name_f] [name_u]Gene[/name_u]
[name_u]Charlie[/name_u] [name_f]Mae[/name_f] and [name_f]Anna[/name_f] [name_u]Gene[/name_u]
From your list I love [name_f]Emma[/name_f] [name_u]Gene[/name_u] the most! Not a big fan of Chole [name_u]Gene[/name_u] as I personally don’t think it flows well but also like “[name_f]Samantha[/name_f]” [name_u]Sammie[/name_u] [name_u]Gene[/name_u] as I love [name_u]Charlie[/name_u] and [name_u]Sammie[/name_u] together 
I like [name_f]Nora[/name_f] [name_u]Gene[/name_u]!!
What about [name_f]Francesca[/name_f] “[name_u]Frankie[/name_u]” [name_u]Gene[/name_u]?
I really like [name_f]Nora[/name_f] [name_u]Gene[/name_u] though it seem a bit more “vintage” than “[name_u]Charlie[/name_u]”. [name_f]Emma[/name_f] [name_u]Gene[/name_u] I think matches the style very well though it isn’t my favorite.
Other suggestions:
[name_f]Lola[/name_f] [name_u]Gene[/name_u]
[name_f]Ella[/name_f] [name_u]Gene[/name_u]
[name_f]Elsie[/name_f] [name_u]Gene[/name_u]
[name_f]Stella[/name_f] [name_u]Gene[/name_u]
[name_u]Darcy[/name_u] [name_u]Gene[/name_u]
[name_u]Riley[/name_u] [name_u]Gene[/name_u]
[name_u]Frankie[/name_u] [name_u]Gene[/name_u]
[name_u]Murphy[/name_u] [name_u]Gene[/name_u]
[name_u]Love[/name_u] [name_f]Chloe[/name_f] [name_u]Gene[/name_u] and [name_f]Emma[/name_f] [name_u]Gene[/name_u]. I think both these names go well with your older daughter, [name_u]Charlie[/name_u]
[name_f]Chloe[/name_f] and [name_u]Charlie[/name_u] both starts with “Ch” - personally I like it. If you prefer to have names that are less similar, you can go with [name_f]Emma[/name_f]. I also like the sound of [name_f]Emma[/name_f] [name_u]Gene[/name_u]!
Suggestions for other first names:
[name_f]Elsie[/name_f] (cute short form of [name_f]Elizabeth[/name_f], like [name_u]Charlie[/name_u] for [name_f]Charlotte[/name_f])
[name_f]Sophie[/name_f] (short and cute like [name_u]Charlie[/name_u], classic like [name_f]Chloe[/name_f] and [name_f]Emma[/name_f], starts with an S like [name_f]Samantha[/name_f])
[name_f]Vicky[/name_f] (cute short form of [name_f]Victoria[/name_f])
[name_f]Eva[/name_f] (short, yet classic like [name_f]Emma[/name_f], but less common)
I love [name_f]Emma[/name_f] [name_u]Gene[/name_u]!