We’ve settled on the middle name of Lynnlee/Lynlee/Linley (combining my sister and MIL’s middle names of Lynn and Lee). Toying with a few different first names, but would like some other suggestions. Last name starts with a T if that also helps. Also, opinions on middle name spelling as well would be respected.
Beatrix Lynnlee
Maeve Lynnlee
Elowen Lynnlee
Edited to add we already have an Arya Margaret as an older sister! Meant to include that originally.
[name_u]Love[/name_u] [name_f]Beatrix[/name_f]!
[name_f]Linley[/name_f] is my favorite spelling, but I appreciate the more direct honor of [name_f]Lynnlee[/name_f] as well.
[name_f]Isolde[/name_f]
[name_f]Imogen[/name_f]
[name_f]Theodora[/name_f]
[name_f]Arwen[/name_f]
[name_f]Anwen[/name_f]
[name_f]Mae[/name_f]
[name_f]Clementine[/name_f]
[name_f]Lyra[/name_f]
[name_f]Lavender[/name_f]
[name_f]Alice[/name_f]
[name_f]Genevieve[/name_f]
[name_f]Freya[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Iris[/name_f]
[name_f]Astrid[/name_f]
[name_f]Luna[/name_f]
[name_f]Matilda[/name_f]
[name_u]Winter[/name_u]
[name_f]Eloise[/name_f]
[name_u]Juniper[/name_u]
[name_f]Cora[/name_f]
[name_f]Nora[/name_f]
[name_u]Rowan[/name_u]
[name_u]Sage[/name_u]
[name_u]Wren[/name_u]
[name_f]Agnes[/name_f]
[name_f]Flora[/name_f]
[name_u]Florence[/name_u]
[name_f]Clover[/name_f]
[name_f]Edith[/name_f]
[name_u]Seren[/name_u]
[name_f]Linley[/name_f] is definitely my choice for spelling.
If you want holiday/winter themed names:
[name_u]Solstice[/name_u] [name_f]Linley[/name_f] T____
[name_f]Noelle[/name_f] [name_f]Linley[/name_f] T____
[name_f]Season[/name_f] [name_f]Linley[/name_f] T____
[name_f]Eirwen[/name_f] [name_f]Linley[/name_f] T____ (it’s Welsh for “white snow” and you could probably play with the spelling)
[name_f]Khione[/name_f] [name_f]Linley[/name_f] T___ (she’s the embodiment of snow in the Greek mythos)
[name_f]Nivea[/name_f] [name_f]Linley[/name_f] T___
[name_u]Winter[/name_u] [name_f]Linley[/name_f] T___ (believe this one was mentioned already)
[name_u]Snow[/name_u] [name_f]Linley[/name_f] T____
[name_u]Storm[/name_u] [name_f]Linley[/name_f] T____
If you do not want themed names:
[name_f]Araiya[/name_f] [name_f]Linley[/name_f] T____
[name_u]Fern[/name_u] [name_f]Linley[/name_f] T___
[name_f]Odessa[/name_f] [name_f]Linley[/name_f] T____
[name_u]Journey[/name_u] [name_f]Linley[/name_f] T____
[name_u]Tierney[/name_u] [name_f]Linley[/name_f] T____
[name_f]Annette[/name_f] [name_f]Linley[/name_f] T____
[name_f]Tirzah[/name_f] [name_f]Linley[/name_f] T____
[name_f]Mirabelle[/name_f] [name_f]Linley[/name_f] T____
Biance [name_f]Linley[/name_f] T____
[name_u]Endellion[/name_u] [name_f]Linley[/name_f] T___
[name_f]Hope[/name_f] this helps! Congratulations on your baby girl 
Wasn’t sure if you wanted to avoid doubling the final sounds on the first/middle names or not!
[name_f]Beatrix[/name_f], [name_f]Maeve[/name_f], and [name_f]Elowen[/name_f] are such great names! And I love that your middle name choice has so much meaning for you. I think in this case I’d stick with [name_f]Lynnlee[/name_f] to maximize the family connection factor, but otherwise I might choose [name_f]Linley[/name_f]. First name suggestions based on your current list…
[name_f]Adelaide[/name_f]
[name_f]Adelia[/name_f]
[name_f]Astrid[/name_f]
[name_f]Clementine[/name_f]
[name_f]Eliza[/name_f]
[name_f]Eloise[/name_f]
[name_u]Florence[/name_u]
[name_f]Freya[/name_f]
[name_f]Georgia[/name_f]
[name_u]Greer[/name_u]
[name_f]Imogen[/name_f]
[name_f]Iris[/name_f]
[name_u]Juniper[/name_u]
[name_f]Lyra[/name_f]
[name_f]Maren[/name_f]
[name_u]Marlowe[/name_u]
[name_f]Matilda[/name_f]
[name_f]Olive[/name_f]
[name_f]Paloma[/name_f]
[name_f]Ramona[/name_f]
[name_u]Lynn[/name_u] [name_u]Lee[/name_u] is how I’d spell her middle 
Your list is gorgeous! Based on those three, I will suggest as well…
[name_f]Tallulah[/name_f]
[name_f]May[/name_f]
[name_f]Viola[/name_f]
[name_f]Thora[/name_f]
[name_f]Guinevere[/name_f]
[name_u]Adair[/name_u]
[name_f]Felicity[/name_f]
[name_f]Willa[/name_f]
[name_f]Rosemary[/name_f]
[name_f]Morag[/name_f]
[name_f]Imogen[/name_f]
[name_f]Frances[/name_f]
[name_f]Beulah[/name_f]
[name_u]Greer[/name_u]
[name_u]June[/name_u]
[name_f]Calliope[/name_f]
[name_f]Elspeth[/name_f]
[name_f]Zelda[/name_f]
[name_f]Coraline[/name_f]
[name_f]Madeleine[/name_f]
[name_f]Bryony[/name_f]
[name_f]Ruthie[/name_f]
[name_f]Nell[/name_f]
[name_f]Maeve[/name_f] [name_f]Linley[/name_f]
Beautiful names! I think Maeve Linley flows the best and looks the most tailored. Next would be Elowen - which looks the prettiest next to Linely (Maeve slightly dominates Linley). I would use the spelling, Linley or possibly Lynn Lee but not the others which look too cre8ive to me.
Otherwise:
Sunday
Elspeth
Zara
Adelaide
Wenna
Arwen
Freya
Faye
Margot
Solana
Auden
Theodora
Maren
Tabitha
Winter
Imogen
Rowenna
Tess
The middle name is cute but I would recommend spelling it [name_f]Linley[/name_f], it looks nice that way and more like one name.
They are all cute. I say [name_f]Elowen[/name_f] [name_f]Linley[/name_f].
[name_f]Elora[/name_f] [name_f]Linley[/name_f]
[name_f]Maia[/name_f] [name_f]Linley[/name_f]
[name_f]Eliana[/name_f] [name_f]Linley[/name_f]
[name_f]Fiona[/name_f] [name_f]Linley[/name_f]
[name_f]Malia[/name_f] [name_f]Linley[/name_f]
[name_u]Ruby[/name_u] [name_f]Linley[/name_f]
[name_f]Juliet[/name_f] [name_f]Linley[/name_f]
I like [name_f]Elora[/name_f] and [name_f]Eliana[/name_f] with [name_f]Linley[/name_f]! 
FWIW I know a [name_f]Lynley[/name_f] and like that spelling too!
[name_f]Maeve[/name_f] [name_f]Lynnlee[/name_f] is lovely!! [name_f]Elowen[/name_f] [name_f]Lynnlee[/name_f] is cute too!!
A few suggestions:
[name_f]Delilah[/name_f] [name_f]Lynnlee[/name_f]
[name_u]Ember[/name_u] [name_f]Lynnlee[/name_f]
[name_f]Maia[/name_f] [name_f]Lynnlee[/name_f]
[name_u]Rowan[/name_u] [name_f]Lynnlee[/name_f]
[name_f]Cassia[/name_f] [name_f]Lynnlee[/name_f]
I’d go with [name_f]Linley[/name_f] because [name_f]Lynlee[/name_f] looks too contemporary next to [name_f]Margaret[/name_f] in her sister’s name. Your three picks all go super well with [name_u]Arya[/name_u]! [name_f]My[/name_f] personal favourite is [name_f]Beatrix[/name_f] [name_f]Linley[/name_f] + [name_u]Arya[/name_u] [name_f]Margaret[/name_f]
[name_u]Lynn[/name_u] [name_u]Lee[/name_u] is my favourite spelling for her middle name! I love [name_f]Elowen[/name_f]!
Some ideas:
[name_f]Daphne[/name_f]
[name_u]Willow[/name_u]
[name_u]Juno[/name_u] / [name_u]June[/name_u]
[name_f]Clementine[/name_f]
[name_u]Hazel[/name_u]
[name_u]Nova[/name_u]
[name_f]Nora[/name_f]
[name_f]Vivienne[/name_f] / [name_u]Vivian[/name_u]
[name_f]Ottilie[/name_f]
[name_f]Mabel[/name_f]
I like [name_f]Beatrix[/name_f] but I’m not sure I’d want the initials BLT. I can’t imagine escaping sandwhich references every time someone comes across my initials.