Sibling for ...

[wooleytoes]

Logan, Netia and Astrid?

I'd love Dominica for a girl but feel like it just doesn't go, especially with Logan

Completely lost for boys names.

what gorgeous names. what about:
girls-
Estel
Valice
Kitty
boys-
Xander
Ovan
Zayn

Estelle is quite nice but the others aren't really to my taste

It seems that you like names that have either a strong N in them or more Scandi names, around six letters or less— for a girl, I'd suggest Sonja/Sonia, Carmen, Ingrid, or even Nica, if you're okay with Netia and Nica.
And for a boy Stefan, Cian/Kian, Conan, Finnian, and Anton .
Best of luck on your name search!

I think Dominica "goes" fine.
For a boy, how about Conrad? Or Torin?

I think you can go for Dominica if you really like it. Whether it goes or not doesn't really matter, as your children will spend far longer as individuals than as part of a sibling group.

Veronica
Damaris
Ophelia
Tamara
Marcia
Susannah
Emmeline
Delphine
Tamsin
Caroline
Coralie

Bram
Silas
Austin
Jasper
Vincent
Malachi
Solomon
Zachary
Ezra
Soren
Keir
Seth

Bella
Alexandra
Katrina

Lucas
Roald
Stefan

I don't think Logan goes with the other two so who cares if Dominica goes with that? It's a nice solid name in its own right - and she would be separate from her siblings much longer than they'll ever be talked about as a group.

Sadie or Anouk

Magnus or Erik

I like Dominica! It goes just fine with your other kids' names.

For a boy how about
Dominic
Quentin
Marcus

Erik
Karl
Douglas
Kirk
Kyle

Ingrid
Crystal
Stella
Esther
Kristina

Dominica goes fine - if you like it just use it.

Delilah is similar ?

Boys:

Eli
Ellis
Miles / Milo
Seth
Cole
Wilf(red)
Otis
Otto
Eric
Barnaby
Sidney
Casper
Rudy/Rudi
Dexter
Nathan/Nathaniel - Nate
Blake
Bodhi
River
Angus
Dominic
Rafferty (Raffy)

Girls:

Imogen
Sadie
Edith / Edie
Margaret /Maggie
Clementine/ Clemmie
Roxanne/Roxanna
Pearl
Delilah
Ottilie (Ottie)
Cora
Eliza
River
Winter
Jemima
Holly

Scarlett
Freya
Greta
Rachel

Edmund
Magnus
Frederick
Oscar