Blended family

Luuk, Nola
Sophia, Ilse, Irene

No idea, just say anything. Congratulations and good luck!

Boy: Mika, Senn, Fynn, Vince, Rowan.
Girl: Danel, Fay, Mila, Fenne, Elin.

I’d definitely go for a name with 5 letters and 2 syllables. The other names also have 2 syllables and 3, 4, or 6 letters!

For a boy, I immediately think of David or Hidde.
And then:
Armin, Boris, Dante, Espen, Fedde, Felix, Ferre, Jarno, Jaron, Jelle, Jesse, Jonas, Joris, Jurre, Maxim, Milan, Oscar, Ruben, Teije, Thian, Tobin
With a different number of letters:
Arthur, Boaz, Casper, Dani, Jelmer, Jesper, Joas, Milo, Otis, Pepijn, Ravi, Revi, Roan, Tristan, Wessel

For a girl, I immediately think of Flore or Milou.
And then:
Amber, Arwen, Aster, Babet, Bodil, Esmee, Estée, Femke, Fenna, Hanna, Josie, Malin, Merel, Mirthe, Pippa, Rhodé, Rivka, Rosie, Tanja, Tessa, Tirza
With a different number of letters:
Carice, Cato, Dané, Daphne, Ella, Evi, Jade, Jasmijn, Juna, Mara, Mare, Rava, Rosa, Thirza, Veerle, Vera,

Sophie, Ise, Noa, Luca, and...

Girl: Elle, Julie, Tatum, Vieve, Robin, Fiene, Veerle, Caro, Jildou, Marèl, Romée, Felien, Sarah, Bente, Wende, Jolijn, Vesper, Hanne, Nele.

Boy: Dante, Otis, Morris, Tieme, Dani, Sebas, Levon, Kalle, Casper, Defon, Taeke, Eden, Rodin.

Our daughter is Evi, which fits in nicely! For a boy, Devi/Davy?

Sophie, Ise, Noa, Luca,
Lars, Tibo, Otis, Xander, Artur, Vic, Mil, Sem, Joren, Aaron, Mathis, Mauro, Lenn, Finn, Ferre, Liam, Bas, Mats, Stan, Sten,
Flo, Bo, Liv, Fenna, Yara, Lily, Emily, Ninthe, Fleur, Olivia, Alix, Eloise, Ella, Anna, Kato, Amy, Feline, Linne, Lisse,

...

All the names of your kids are popular names that rank high in the top ten/twenty. I’d continue that trend.
Milan, Sem, or Finn
Tess, Mila, or Anna