[name_m]Hi[/name_m] there.
I like your sons’ names. They’re masculine yet have a softer sound. I think that a feminine girl name is what I’d pick for a little sister.
Here are my thoughts on your current list-
[name_u]Emery[/name_u]-This is not my favorite. It’s sort of trendy & sort of boyish.
[name_f]Eloise[/name_f]-[name_m]Just[/name_m] gorgeous! Feminine, classic, spunky, simple & not over done. A perfect fit w/Hayes & [name_m]Wes[/name_m].
[name_u]Ellis[/name_u]-I would totally pick this as a brother to [name_u]Hayes[/name_u] & [name_m]Wes[/name_m]. Not so much for a sister.
[name_f]Grace[/name_f]-This is a bit over done & also rhymes w/Hayes.
[name_f]Genevieve[/name_f]-[name_f]Evie[/name_f] is adorable. It’s sweet, spunky, feminine & a little pixie-ish. Perfect w/Hayes & [name_m]Wes[/name_m]. [name_f]Genevieve[/name_f] is not my personal favorite, but it’s perfectly nice & fits in well. I would love just [name_f]Eve[/name_f] nn [name_f]Evie[/name_f].
[name_f]Olivia[/name_f]-I love this name, but unfortunately so does every one else. It’s sooo popular. It’s is a beautiful bold charming classic though. And the nn [name_f]Livy[/name_f] is super sweet.
A few more ideas…sorry or any repeats!
[name_f]Alice[/name_f]
[name_f]Audrey[/name_f]
[name_f]Amelie[/name_f]
[name_f]Bridget[/name_f]/Bridie
[name_f]Clara[/name_f]
[name_u]Clare[/name_u]
[name_f]Celia[/name_f]
[name_f]Cecily[/name_f]
[name_f]Daphne[/name_f]
[name_f]Delia[/name_f]
[name_f]Emilia[/name_f]/Millie
[name_f]Flora[/name_f]
[name_f]Freya[/name_f]
[name_f]Frances[/name_f]/Franny
[name_f]Gemma[/name_f]
[name_f]Greta[/name_f]
[name_f]Georgia[/name_f]/Gigi
[name_f]Gwyneth[/name_f]/Gwen
[name_f]Imogen[/name_f]/Imee/Idgie/Ginny
[name_u]June[/name_u]/Junie
[name_f]Juliet[/name_f]
[name_f]Josephine[/name_f]
[name_f]Lucy[/name_f]
[name_f]Lila[/name_f]
[name_f]Lydia[/name_f]
[name_f]Laurel[/name_f]
[name_f]Maeve[/name_f]
[name_f]Mara[/name_f]
[name_f]Maren[/name_f]
[name_f]Molly[/name_f]
[name_f]Matilda[/name_f]/Millie
[name_f]Nora[/name_f]
[name_f]Olive[/name_f]/Livy
[name_f]Phoebe[/name_f]
[name_f]Penelope[/name_f]/Penny/Polly/Poppy/Nellie
[name_u]Ruby[/name_u]
[name_f]Rose[/name_f]/Rosie
[name_f]Rosalie[/name_f]/Rosie
[name_f]Sofie[/name_f]
[name_f]Sadie[/name_f]
[name_f]Thea[/name_f]
[name_u]Vivian[/name_u]/Vivie
[name_f]Violet[/name_f]
[name_u]Vida[/name_u]/Vivie
[name_f]Hope[/name_f] this helps.