Ignore the names I have listed on my signature. I’m really curious to know what others picture as a sister to [name]Nora[/name]. Perhaps I’ll discover a new name I love! 
[name]Nora[/name] and [name]Hazel[/name]
[name]Nora[/name] and [name]Fern[/name]
[name]Nora[/name] and [name]Maren[/name]
[name]Nora[/name] and [name]Poppy[/name]
[name]Nora[/name] and [name]Eloise[/name]
[name]Nora[/name] and [name]Blyth[/name]
[name]Lydia[/name], [name]Lucy[/name], [name]Ava[/name], [name]Maeve[/name], [name]Isla[/name], [name]Lorelei[/name], [name]Lotte[/name], [name]Wren[/name], [name]Pearl[/name], [name]Willa[/name], [name]Ruby[/name], [name]Fiona[/name], [name]Poesy[/name], [name]Clara[/name], [name]Ivy[/name], [name]Phoebe[/name]
(including names from your list, I would have added [name]Maeve[/name], [name]Zoe[/name], [name]Bronwen[/name], and [name]Mary[/name], but really, most of your choices sound great with [name]Nora[/name] to me)
I was trying to ignore your list but checked to see if my choice was there- it is! [name]Eve[/name]!
Other suggestions, [name]Nora[/name] and…
[name]Pearl[/name]
[name]Geneva[/name]
Haddie
[name]Dahlia[/name]
Sosi
[name]Marin[/name]
[name]Nora[/name] and…
[name]Lucy[/name]
[name]Alice[/name]
[name]Jane[/name]
[name]Margot[/name]
[name]Zoe[/name]
(without looking at your list or anyone elses suggestions)
[name]Lena[/name] or [name]Leta[/name]
[name]Elowen[/name]
[name]Claire[/name]
[name]Maren[/name]
[name]Caroline[/name]
[name]Willow[/name]
[name]Alice[/name]
[name]Daphne[/name]
[name]Edith[/name]
[name]Frances[/name]
[name]Grace[/name]
[name]Helen[/name]
[name]Iris[/name]
[name]Josephine[/name]
[name]Lily[/name]
[name]Lucy[/name]
[name]Margaret[/name]
[name]Susan[/name]
[name]Violet[/name]
[name]Nora[/name] and
[name]Alix[/name], [name]Amy[/name], [name]Belinda[/name], [name]Bridget[/name], [name]Calliope[/name], [name]Christine[/name]/[name]Christy[/name], [name]Daphne[/name], [name]Deirdre[/name], [name]Elin[/name], [name]Elke[/name], [name]Ellen[/name], [name]Faith[/name], [name]Felicity[/name], [name]Fiona[/name], [name]Francesca[/name],
[name]Gemma[/name], [name]Genevieve[/name], [name]Gillian[/name], [name]Ginger[/name], [name]Grace[/name], [name]Hedwig[/name], [name]Jeannie[/name], [name]Justine[/name], [name]Linnea[/name], [name]Lucia[/name], [name]Quinn[/name],
[name]Rebecca[/name], [name]Rosemary[/name], [name]Una[/name], [name]Valentine[/name], [name]Wendy[/name], [name]Ziva[/name]
Good [name]Luck[/name]!
I am going to suggest some mid-century favorites. I am feeling retro. There may be some names here that you may not have thought of using. I think they feel fresh not old.
[name]Meg[/name] as a nn for [name]Margaret[/name] or [name]Megan[/name]
[name]Nancy[/name] or [name]Nanette[/name] - I like [name]Nan[/name] - it’s cute! Built-in grandma name too! The grand-kids get to call her by her real name! 
[name]Dorothy[/name] or [name]Dorothea[/name] - nn [name]Dot[/name] or [name]Dottie[/name]
[name]Rosie[/name] - full name can be [name]Rosemary[/name], [name]Rosalie[/name], [name]Rosanna[/name], etc.
[name]Diana[/name]
[name]Patricia[/name] - [name]Tricia[/name], [name]Trish[/name]
[name]Penelope[/name] - [name]Penny[/name], [name]Nell[/name] or [name]Nelly[/name]
[name]Eleanor[/name] or [name]Helen[/name] - [name]Nell[/name], [name]Nelly[/name]
[name]Elaine[/name]
[name]Eileen[/name] would be a nice matchy mn…
[name]Nora[/name] and [name]Gabrielle[/name]
I would name her [name]Phoebe[/name]
[name]Nora[/name] and [name]Beth[/name] came to my mind… love all your other choices, but this is a different one to think about They sound like little pottery barn girls!
I know it has been very popular, but I love [name]Nora[/name] and [name]Lizzie[/name] together. [name]Nora[/name] and [name]Elizabeth[/name] is my idea of perfection. I think any other classic that has a good nickname ending in “y” sound would be nice. [name]Nora[/name] and [name]Emmeline[/name] ([name]Emme[/name]), for example.
[name]Nora[/name] and [name]Hazel[/name]!
[name]Nora[/name] is one of my all time favorites! I would pair it with any of the names in my signature but I particularly love it with [name]Olive[/name], [name]Lydia[/name], and [name]Tamsin[/name]
I think [name]Nora[/name] and [name]Hattie[/name] make a great sisters. But I confess the combo is from the show parenthood 
[name]Nora[/name] and [name]Viola[/name]
[name]Nora[/name] and [name]Ida[/name]
[name]Nora[/name] and [name]Esme[/name]
[name]Nora[/name] and [name]Fleur[/name]
[name]Nora[/name] and [name]Jane[/name]
[name]Nora[/name] and [name]Vita[/name]
[name]Nora[/name] and [name]Rose[/name]
[name]Nora[/name] and [name]Elva[/name]
[name]Nora[/name] & [name]Misha[/name]
[name]Nora[/name] & [name]Ella[/name]
[name]Nora[/name] & [name]Amelia[/name]
[name]Nora[/name] & [name]Maisie[/name]/[name]Maisy[/name]
[name]Nora[/name] & [name]Olivia[/name]
[name]Nora[/name] & [name]Isla[/name]
[name]Nora[/name] & [name]Ivy[/name]
[name]Nora[/name] & [name]Daisy[/name]
[name]Nora[/name] & [name]Charlotte[/name]
[name]Nora[/name] & [name]Bronte[/name]
[name]Nora[/name] & [name]Talia[/name]
[name]Nora[/name] & [name]Sophia[/name]
[name]Nora[/name] & [name]Mia[/name]
[name]Nora[/name] & [name]Imogen[/name]
[name]Nora[/name] & [name]Lola[/name]
[name]Nora[/name] & [name]Chloe[/name]
[name]Nora[/name] & [name]Claire[/name]
[name]Nora[/name] & [name]Rhonda[/name]
[name]Nora[/name] & [name]Juliet[/name]
[name]Nora[/name] & [name]Jolene[/name]
[name]Nora[/name] & [name]Charlene[/name]
[name]Nora[/name] & [name]Marli[/name]
Best Wishes x
Alice
Audrey
Edith
Iris
Mabel
Margot
Although of these I think Mabel goes the best. Good luck xx