what goes with the other 3 names

Phoenix (unisex), Lennon, Lewis, Floyd
I'm not sure about girls' names that would fit well and aren't too popular..

Then I'll call out a few girl names: Kate, Brooke, Alana, Néomi, Tory, Teri, Dawn, Megan, Ellis.
And Leanne (Lee-anne) can be both in Dutch and in English (Lee-ann). Is Joanna in Dutch or in English?

Since you already have names with 6, 3, and 5 letters, I'd go for a 4-letter name now.

First combos I'm thinking of:
Joanna, Zoë, Scott, and Dean
Joanna, Zoë, Scott, and Evan

More:
Adam, Alec, Boyd, Cody, Dave, Liam, Luke, Matt, Milo, Nino, Otis, Owen, Quin, Ryan, Senn

For a girl:
Joanna, Zoë, Scott, and Erin
Joanna, Zoë, Scott, and Ruby

More:
Abby, Dana, Dané, Eden, Faya, Faye, Gaby, Gail, Gina, Gwen, Hope, Indy, Izzy, Kacy, Kady, Kate, Lana, Leah, Lizz, Loïs, Lynn, Maci, Maya, Phae, Quin, Rhea, Romy, Rose, Roxy

Girls' names

Joanna and Rosie
Joanna and Cezanne
Joanna and Elizabeth
Joanna and Robyn
Joanna and Roxanne
Joanna and Emely
Joanna and Gabriella
Joanna and Rosanne
Joanna and Rachelle
Joanna and Camilla
Joanna and Frances
Joanna and Yasmin
Joanna and Adeline
Joanna and Jackie
Joanna and Mathilda
Joanna and Odette
Joanna and Charline
Joanna and Joelle
Joanna and Felice
Joanna and Edith
Joanna and Violette
Joanna and Cosette
Joanna and Coralie
Joanna and Morgan
Joanna and Angela
Joanna and Josephine
Joanna and Daniella
Joanna and Megan
Joanna and Clarisse
Joanna and Luce
Joanna and Soetkin
Joanna and Felicia
Joanna and Thelma
Joanna and Evelyn
Joanna and Savannah

Boys' names

Joanna and August
Joanna and Isaac
Joanna and Sebastian
Joanna and Antoine
Joanna and Martin
Joanna and Dorian
Joanna and Edouard
Joanna and Damian
Joanna and Christian
Joanna and Amaury
Joanna and Roman
Joanna and Joseph
Joanna and Maurits
Joanna and Marcus
Joanna and Richard
Joanna and Bernard
Joanna and Achilles
Joanna and Lucian
Joanna and Julian
Joanna and Leonard
Joanna and Romeo
Joanna and Marlon
Joanna and Nicholas

What I'm thinking:
Joanna, Zoë, Scott and...
Owen
Tyler
Mason
Rendall
Wyatt
Seth
Jay

Tyla
Seba
Grace
Lily
Jenna
Luci
Toya

Good luck