[name_m]Hi[/name_m]! We’re so stuck trying to find a name we like as much as [name_f]Ellie[/name_f] for our daughter who will be the sister of [name_u]Quinn[/name_u] (boy). We ruled out [name_f]Ellie[/name_f] because it’s too popular. Same with [name_f]Zoey[/name_f] and [name_f]Lily[/name_f].
Any ideas for something unique and interesting, maybe with a cool first-letter like [name_u]Quinn[/name_u]? Maybe with Irish heritage like [name_u]Quinn[/name_u]?
Thanks in advance for any ideas!
Maybe [name_f]Molly[/name_f]? Similar in sound to [name_f]Ellie[/name_f] and [name_f]Lily[/name_f] and has an Irish feel like [name_u]Quinn[/name_u], but out of the U.S. top 150!
[name_u]Rory[/name_u]
[name_u]Regan[/name_u]
[name_f]Zena[/name_f]
[name_f]Bronwen[/name_f]
[name_f]Colleen[/name_f]
[name_f]Erin[/name_f]
[name_u]Shannon[/name_u]
I think [name_f]Xanthe[/name_f] might be perfect for you 
I think it sounds awesome with [name_u]Quinn[/name_u] and I love the Q & X initials
Keely/Keelan
[name_f]Briony[/name_f]
[name_u]Ellery[/name_u]
[name_f]Tillie[/name_f]
[name_u]Riley[/name_u]
[name_u]Sloane[/name_u]
[name_u]Rowan[/name_u]
[name_f]Bree[/name_f]
Roisin/Rosie
[name_u]Shea[/name_u]
[name_u]Cassidy[/name_u]
[name_f]Erin[/name_f]
[name_f]Elsie[/name_f]
[name_m]Hi[/name_m] there.
I know boy/girl siblings named [name_u]Quinn[/name_u] & [name_u]Sloane[/name_u]. I love those together!
Here are a few more ideas that you may like:
[name_f]Audrey[/name_f]
[name_f]Aine[/name_f]
[name_f]Aoibhe[/name_f]
[name_f]Bridget[/name_f]
[name_f]Cecily[/name_f]
[name_f]Daphne[/name_f]
[name_f]Eloise[/name_f]
[name_f]Eilidh[/name_f]
[name_f]Elowen[/name_f]
[name_f]Esme[/name_f]
Fiona-my doggy’s name! 
[name_f]Finola[/name_f]
Finuala
[name_f]Gwyneth[/name_f]
[name_f]Greta[/name_f]
[name_u]Holly[/name_u]
[name_u]Haley[/name_u]
[name_f]Lola[/name_f]
[name_f]Lydia[/name_f]
[name_f]Molly[/name_f]
[name_f]Maeve[/name_f]
[name_f]Maire[/name_f]
[name_f]Maren[/name_f]
[name_u]Malin[/name_u]
[name_f]Nuala[/name_f]
[name_f]Niamh[/name_f]
[name_f]Olive[/name_f]
[name_f]Phoebe[/name_f]
[name_f]Polly[/name_f]
[name_u]Ruby[/name_u]
[name_f]Rosalie[/name_f]
[name_f]Stella[/name_f]
Tess(a)
[name_f]Violet[/name_f]
[name_f]Willa[/name_f]
[name_f]Zella[/name_f]
[name_f]Hope[/name_f] this helps. 
Yanci or Yancie
[name_u]Quinn[/name_u] and [name_f]Ada[/name_f]
[name_u]Quinn[/name_u] and [name_u]Finley[/name_u]
[name_u]Quinn[/name_u] and [name_u]Harper[/name_u]
[name_u]Quinn[/name_u] and [name_f]Nora[/name_f]
[name_u]Quinn[/name_u] and [name_u]Tatum[/name_u]
[name_u]Quinn[/name_u] and [name_u]Wren[/name_u]
[name_u]Love[/name_u] the suggestion of [name_f]Xanthe[/name_f]! Has the cool first letter and similar sounds to [name_f]Ellie[/name_f] but way more distinct and as spunky as [name_u]Quinn[/name_u].
Some other thoughts:
Zali
[name_f]Willa[/name_f]
[name_f]Iona[/name_f] (Celtic origins and unusual first letter)
[name_f]Una[/name_f] (again Celtic origins and unusual first letter)
[name_f]Izora[/name_f]
[name_u]Quinn[/name_u] and…
[name_f]Erin[/name_f]
[name_f]Orla[/name_f]
[name_f]Una[/name_f]
[name_f]Elara[/name_f]
[name_u]Sage[/name_u]
[name_f]Ada[/name_f]
[name_f]Claire[/name_f]
[name_f]Eva[/name_f]
[name_f]Zara[/name_f]
[name_u]Quinn[/name_u] and …
[name_f]Annie[/name_f]
[name_u]Bo[/name_u]
[name_f]Bonnie[/name_f]
[name_u]Cassidy[/name_u] nn [name_f]Cassie[/name_f] / [name_u]Sid[/name_u]
[name_f]Clover[/name_f]
[name_f]Dulcie[/name_f]
[name_f]Essie[/name_f]
[name_f]Heidi[/name_f]
[name_f]Ida[/name_f]
[name_f]Juno[/name_f]
[name_u]Jessie[/name_u]
[name_f]Leila[/name_f]
[name_u]Lark[/name_u]
[name_f]Marcie[/name_f]
[name_f]Marnie[/name_f]
[name_u]Ruby[/name_u]
[name_f]Sylvie[/name_f]
[name_u]Wren[/name_u]
X
[name_f]Welcome[/name_f]! How about:
[name_u]Quinn[/name_u] & [name_f]Kady[/name_f]
[name_u]Quinn[/name_u] & [name_u]Fallon[/name_u]
[name_u]Quinn[/name_u] & [name_u]Darcy[/name_u]
[name_u]Quinn[/name_u] & [name_u]Delaney[/name_u]
[name_u]Quinn[/name_u] & [name_u]Darby[/name_u]
[name_u]Quinn[/name_u] & [name_u]Murphy[/name_u]
[name_u]Quinn[/name_u] & [name_u]Keeley[/name_u]