We have three boys [name_u]Cameron[/name_u], [name_m]Quinton[/name_m], & [name_m]Ryder[/name_m]. [name_u]Cameron[/name_u] dad picked we were young and it was popular. I really liked [name_m]Quinton[/name_m] and [name_m]Ryder[/name_m] because I had only heard each name once and thought they were strong and different, now I hear them both regularly. I think I would have named [name_m]Ryder[/name_m] [name_m]Ryker[/name_m] had dad approved. We believe we are having a girl, and are trying to find names. I am not a girly girl, but don’t know how boyish is too boyish. I tend to lean for [name_f]Dylann[/name_f] [name_f]Jane[/name_f], [name_u]Blakely[/name_u] [name_f]Jane[/name_f], and Kopelynn is my favorite. I really don’t like common names [name_u]Addison[/name_u] is as common as I feel I can go. I kind of like [name_f]Isla[/name_f], and [name_u]Lynden[/name_u] but we are really struggling here. Please help, what is the first feeling from Kopelynn and Dylann?
Well, I’m probably not the person to ask since I detest boys names in girls. I really dislike [name_u]Dylan[/name_u], Kopelynn, and [name_u]Blakely[/name_u]. [name_f]Isla[/name_f] is much prettier. [name_m]How[/name_m] about girls names that are less frilly like:
[name_f]Phoebe[/name_f]
[name_f]Margot[/name_f]
[name_f]Sienna[/name_f]
[name_f]Tessa[/name_f]
[name_f]Liv[/name_f]
[name_f]Stella[/name_f]
[name_f]Lola[/name_f]
[name_f]Frances[/name_f]
[name_u]Delaney[/name_u]
[name_f]Elle[/name_f]
[name_f]Daphne[/name_f]
[name_f]Mira[/name_f]
[name_f]Carys[/name_f]
I’m not a fan of Kopelynn. It just looks a bit thrown together. I love the suggestion of [name_u]Delaney[/name_u] above. There are some great names out there that are not too frilly/girly for girls. Here’s a few others …
[name_u]Avery[/name_u]
[name_u]Emery[/name_u]
[name_u]Reese[/name_u]
[name_u]Oakley[/name_u]
[name_u]Shiloh[/name_u]
[name_u]Arden[/name_u]
[name_u]Finley[/name_u]
[name_f]Greer[/name_f]
[name_u]Skyler[/name_u]
[name_u]Rowan[/name_u]
[name_u]Presley[/name_u]
[name_u]Paisley[/name_u]
[name_u]Kennedy[/name_u]
[name_f]Lark[/name_f] or [name_u]Larkin[/name_u]
[name_u]Rory[/name_u]
I like [name_f]Isla[/name_f]. The others are either strongly masculine to me or very trendy - neither are styles I much like.
[name_f]Adrienne[/name_f]
[name_u]Andrea[/name_u]
[name_f]Eve[/name_f]
[name_f]Indie[/name_f]
[name_u]Juniper[/name_u]
[name_f]Leah[/name_f]
[name_f]Lola[/name_f]
[name_f]Lulu[/name_f]
[name_f]Nerissa[/name_f]
[name_f]Romilly[/name_f]
[name_f]Sadie[/name_f]
[name_f]Scarlett[/name_f]
[name_f]Tallulah[/name_f]
I’m not a fan of boys’ names on girls, but [name_u]Dylan[/name_u] is ok, I guess. I would spell it the regular way, with one N. Spelling it with two isn’t going to make it more feminine. [name_f]Isla[/name_f] is very pretty. I would nix Kopelynn.
Some other options…
[name_u]Jamie[/name_u]
[name_f]Bronwyn[/name_f]
[name_f]Brynn[/name_f]
[name_u]Eden[/name_u]
[name_u]Everly[/name_u]
[name_u]Finley[/name_u]
[name_f]Harlow[/name_f]
[name_f]Iris[/name_f]
[name_f]Ilene[/name_f]
[name_f]Kaia[/name_f]/[name_f]Kaya[/name_f]
[name_f]Nell[/name_f]/[name_u]Nelly[/name_u]
[name_f]Naomi[/name_f]
[name_f]Noemi[/name_f]
[name_f]Opal[/name_f]
[name_u]Phoenix[/name_u]
[name_f]Pippa[/name_f]
[name_u]Riley[/name_u]
[name_u]Rowan[/name_u]
[name_f]Tess[/name_f]
[name_u]Wren[/name_u]
By the way, I also like [name_u]Linden[/name_u]/[name_u]Lynden[/name_u]. It’s one of my favorite nature names. 
Your boys’ names are great too!
If you like Kopelyn, I would suggest: [name_u]Cameron[/name_u], [name_m]Ryder[/name_m], [name_m]Quinton[/name_m], and:
[name_u]Sage[/name_u] … [name_u]Juniper[/name_u] nickname [name_u]Peri[/name_u] or [name_f]Juni[/name_f] … [name_u]Piper[/name_u] … [name_f]Jolie[/name_f] (joey is a cute nn) … [name_u]Robin[/name_u]
[name_u]Avery[/name_u] … [name_f]Ashlyn[/name_f] … [name_f]Willow[/name_f] … [name_f]Bridget[/name_f] nn [name_f]Bree[/name_f], [name_u]Britt[/name_u], or [name_u]Jet[/name_u] … [name_u]Channing[/name_u] (nickname chance or chace)
[name_f]Cleo[/name_f] … [name_u]Dakota[/name_u] … [name_f]Chesney[/name_f] (CHEZZ- knee) means peacemaker … [name_f]Cheslea[/name_f] … [name_f]Cadence[/name_f]
[name_u]Kelsey[/name_u] … [name_u]Kelley[/name_u]/[name_u]Kelly[/name_u] … [name_f]Jade[/name_f] or [name_f]Jada[/name_f] … [name_u]Ember[/name_u] or Emberley … [name_u]Emery[/name_u] … [name_u]Devin[/name_u]/[name_u]Devon[/name_u]
[name_f]Kyla[/name_f] … [name_u]Eden[/name_u] … [name_u]Finley[/name_u]/[name_u]Finlay[/name_u] … [name_f]Gracelyn[/name_f] … [name_u]Holland[/name_u] … [name_u]Hollis[/name_u] … [name_u]Haven[/name_u] … [name_u]Hadley[/name_u] … [name_f]Ivy[/name_f]
[name_f]Judith[/name_f] nn [name_u]Jude[/name_u] … [name_u]Jordan[/name_u] … parker … [name_u]Alex[/name_u] (just alex) … [name_f]Lexa[/name_f] / [name_f]Kenna[/name_f] / [name_u]Tierney[/name_u]
[name_f]Zoey[/name_f] … [name_f]Jocelyn[/name_f] … [name_u]Tyler[/name_u] … [name_u]Sheridan[/name_u] … [name_u]Shaun[/name_u]/[name_u]Shawn[/name_u] … [name_u]Raven[/name_u] … [name_u]Phoenix[/name_u] … [name_u]Laurence[/name_u]
[name_u]Austen[/name_u] … [name_u]Rowan[/name_u] … [name_u]Wren[/name_u] … [name_u]Larkin[/name_u]
I like [name_u]Dylan[/name_u] [name_f]Jane[/name_f]! I personally prefer it with only one n. If you’re really attached to the second n, I don’t think [name_f]Dylann[/name_f] is awful. I’m not fond of [name_u]Blakely[/name_u] and I really dislike Kopelynn.
I like [name_u]Linden[/name_u]. I prefer the [name_u]Linden[/name_u] spelling over [name_u]Lynden[/name_u].
[name_f]Adelyn[/name_f]
[name_m]Fyfer[/name_m]
[name_f]Afton[/name_f]
[name_f]Sidonie[/name_f]
[name_f]Elowen[/name_f]
[name_u]Devon[/name_u]
[name_u]Rowan[/name_u]
[name_f]Jessamyn[/name_f]
[name_f]Bronwyn[/name_f]
Maitland
[name_u]Juniper[/name_u]
I dont like kopelyn. It reminds me of cupelan which is the surname of a boy i went to chool with and it feels very masculine to me.
[name_u]Blakely[/name_u] is ok id prefer henley bailey brielly laklyn or elkie
dylan i love but prefer it on a boy prehaps parker harlen harley logan or reese
Some suggestions
ainsley
[name_f]Adrienne[/name_f]
[name_u]Arden[/name_u]
[name_f]Anwen[/name_f]
[name_u]Rowan[/name_u]
[name_u]Rory[/name_u]
aspen
[name_u]Brooklyn[/name_u]
carys
[name_f]Harlow[/name_f]
[name_u]Marlow[/name_u]
winslow
[name_u]Morgan[/name_u]/morgana
[name_f]Romilly[/name_f]
skylyn
[name_f]Thea[/name_f]
peridot
My first thought was [name_f]Iselin[/name_f].
[name_f]Ottoline[/name_f]
[name_f]Soleil[/name_f]
[name_u]Shiloh[/name_u]
[name_f]Juno[/name_f]
[name_f]Ramona[/name_f]
I am a fan of unisex names and boy names on girls. I think [name_u]Dylan[/name_u] is super cute. I have also met a girl [name_u]Devin[/name_u]. Not really a fan of [name_u]Blakely[/name_u]. Kopelynn, I like the sound, but the spelling looks a but off to me.
I think some good choices for you are:
[name_u]Quinn[/name_u]
[name_u]Rowan[/name_u]
[name_u]Saige[/name_u]/[name_u]Sage[/name_u]
[name_u]Reagan[/name_u]
[name_u]Charlie[/name_u]
[name_u]Emery[/name_u]
[name_u]Arden[/name_u]
[name_u]Rory[/name_u]
[name_u]Avery[/name_u]
[name_u]Finley[/name_u]- I think nm [name_u]Finn[/name_u] is cute on a girl
[name_u]Tristan[/name_u]
I would suggest a name that definitely says “girl” after naming three boys. It wouldn’t have to be too girly but would it be nice for her to have a name that stands out from her brothers. I really like [name_f]Isla[/name_f] from your list. Some other suggestions…
[name_f]Willa[/name_f]
[name_u]Addison[/name_u]
[name_f]Julia[/name_f]
[name_f]Maisie[/name_f]
[name_f]Margot[/name_f]
[name_u]Ariel[/name_u]/[name_f]Arielle[/name_f]
[name_f]Brynn[/name_f]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & Copeland would be cute. I don’t like the spelling you have to best honest… Copeland [name_f]Jane[/name_f] would be cute and I’ve always thought CJ was a pretty cute nickname for a girl.
[name_f]Dylann[/name_f] looks like Dill-anne to be with the two Ns. [name_u]Dylan[/name_u] is feminine enough. [name_u]Dylan[/name_u] [name_f]Jane[/name_f] is alright, and goes well with her brothers names.
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Dylan[/name_u]
I don’t like [name_u]Blakely[/name_u] at all.
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Addison[/name_u] sound really great together, and I like [name_f]Addie[/name_f] as a nickname.
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Josephine[/name_f] “[name_u]Joey[/name_u]” (or [name_f]Josette[/name_f], [name_f]Josephina[/name_f], [name_f]Joanna[/name_f], [name_f]Joanne[/name_f], maybe [name_f]Jocelyn[/name_f])
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Jocelyn[/name_f] “[name_u]Joss[/name_u]”
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Willa[/name_f]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Parker[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Sadie[/name_f]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Jordan[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Ellery[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Elliot[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Val[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Blaire[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Reid[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Charlotte[/name_f] “[name_u]Charlie[/name_u]”
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_u]Dory[/name_u]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_m]Clarke[/name_m]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Isla[/name_f]- is also cute! I forgot to say that.
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Ayla[/name_f]
[name_u]Cameron[/name_u], [name_m]Quinton[/name_m], [name_m]Ryder[/name_m] & [name_f]Thea[/name_f]
I think Kopelynn would be cute with your other kids names. They’re all very modern and spunky. My favorite from your choices would be [name_u]Blakely[/name_u] [name_f]Jane[/name_f]. It’s really cute!
Copeland is my maiden name and perhaps a less creative version of Kopelynn? I am also not a fan of boy names for girls, but some names that are still feminine but not frilly could be:
[name_u]Harper[/name_u]
[name_f]Tess[/name_f]
[name_u]Lane[/name_u]
[name_f]Claire[/name_f]
[name_u]Blair[/name_u]
[name_f]Tenley[/name_f] (not a big fan, but the are worse choices out there)
[name_u]Everly[/name_u]
[name_u]Peyton[/name_u]
[name_u]Avery[/name_u]
[name_u]Reese[/name_u]
[name_u]Arden[/name_u]
[name_f]Isla[/name_f] [name_f]Jane[/name_f] is perfection to me for her name. She needs to stand out as the baby sister (imho)…
It is not too frilly and has the sweetest sound…
My favorite suggestions from other commenters are [name_f]Greer[/name_f], [name_u]Skyler[/name_u], and [name_u]Juniper[/name_u].
I had three boys then a girl and her name is [name_f]Josephine[/name_f]. I liked that her name is very feminine, but her nn, [name_u]Jo[/name_u], is very boyish. Your style is very different from mine, but I wanted to suggest it! 
I really dislike Kopelynn.
But I like [name_u]Blakely[/name_u] [name_f]Jane[/name_f] and love the earlier suggestion of [name_f]Isla[/name_f] [name_f]Jane[/name_f].
Based on your style I further recommend:
Lakin or Lakyn
Wryn
[name_u]Arden[/name_u]
Brinkley
Good luck!