What would you name my 3rd?

General Name Discussion
1

Sibling for [name_m]Nils[/name_m] and [name_f]Serafina[/name_f]. …

2

Girls:
[name_f]Ophelia[/name_f]
[name_f]Cecilia[/name_f]
[name_f]Delphine[/name_f]
[name_f]Evangeline[/name_f]
[name_f]Cordelia[/name_f]
[name_f]Persephone[/name_f]
[name_f]Esme[/name_f]
[name_f]Adelaide[/name_f]
[name_f]Varinia[/name_f]
[name_f]Sisley[/name_f]

Boys:
[name_m]Roman[/name_m]
[name_m]Cian[/name_m]
[name_m]Lincoln[/name_m]
[name_m]Lars[/name_m]
[name_m]Pierce[/name_m]
[name_u]Jude[/name_u]
[name_m]Hendrik[/name_m]
[name_m]Maximus[/name_m]
[name_u]Blaine[/name_u]
[name_u]Rhys[/name_u]

3

[name_f]Adelaide[/name_f]
[name_f]Rachelle[/name_f]
[name_f]Doreen[/name_f]
[name_f]Madelyn[/name_f]
[name_f]Verity[/name_f]
Victore
[name_f]Vanessa[/name_f]
[name_f]Evangeline[/name_f]
[name_f]Adeline[/name_f]
[name_f]Natalie[/name_f]
[name_f]Natalia[/name_f]
[name_f]Rosalie[/name_f]
[name_f]Rosalyn[/name_f]
[name_f]Fantasia[/name_f]
[name_f]Eliana[/name_f]
[name_f]Ambrosia[/name_f]
[name_f]Liliana[/name_f]

Other long and frilly but pretty names for a girl, maybe with a greek or french touch. I think using one with an L would really match it with [name_m]Nils[/name_m] without being to close.
Or maybe just [name_f]Faye[/name_f], [name_f]Ivy[/name_f], or [name_f]Iris[/name_f], short like [name_m]Nils[/name_m] but long like your daughters?

[name_m]Leo[/name_m]
[name_m]Vann[/name_m]
[name_m]Dax[/name_m]
[name_m]Eros[/name_m]
[name_f]Ceres[/name_f]
[name_u]Jace[/name_u]
[name_m]Alec[/name_m]
[name_u]Rhys[/name_u]
[name_m]Luke[/name_m]
[name_m]Caius[/name_m]
[name_m]Mars[/name_m]
[name_m]Lars[/name_m]
[name_m]Arc[/name_m]
[name_m]Venn[/name_m]

Maybe a short but rarer one or two syllable name to match [name_m]Nils[/name_m]

4

How about Cornelia or Laura?

5

[name_m]Nils[/name_m], [name_f]Seraphina[/name_f], and…

[name_f]Penelope[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Juliet[/name_f]

[name_m]Henry[/name_m]
[name_m]Othello[/name_m]
[name_m]Abram[/name_m]

Tried thinking of a third that would be distinctive in sound from the first two but still similar in style.

6

[name_m]Lars[/name_m]
[name_m]Fredrik[/name_m]
[name_m]Thor[/name_m]
[name_m]Johan[/name_m]

[name_f]Charlotte[/name_f]
[name_f]Kaisa[/name_f]
[name_f]Johanna[/name_f]
[name_f]Freya[/name_f]

7

[name_u]Rhys[/name_u] & [name_f]Clementine[/name_f]

8

I would choose [name_m]Leander[/name_m] or [name_f]Carys[/name_f].

9

[name_f]Opal[/name_f] or [name_f]Verity[/name_f].

10

Boy
[name_m]Melo[/name_m]

Girl
[name_f]Sabreea[/name_f]
[name_f]Fernanda[/name_f]
[name_f]Lissette[/name_f]
Maurina
[name_f]Zilla[/name_f]
Ishania
[name_f]Sallvia[/name_f] / [name_f]Salvia[/name_f]
[name_f]Yesenia[/name_f]
Adilia
[name_f]Ayana[/name_f]
[name_f]Genoveva[/name_f]
[name_f]Cerelia[/name_f]
Laveda
[name_f]Marcelia[/name_f]
[name_f]Cecily[/name_f]

11

[name_m]Romeo[/name_m], [name_m]Jasper[/name_m], [name_f]Vivienne[/name_f], Adahlia

12

From your list [name_m]Olin[/name_m] & [name_f]Elowen[/name_f] based on your children’s names.

13

[name_m]Tor[/name_m]
[name_u]Seth[/name_u]
[name_u]Blaise[/name_u]