Looking for 4 letter baby names boy and girl

[Benby]

Hi everyone,
I have 3 dc. Dd1 is Erin, dd2 is Leah and ds is Dara.
I need a 4 letter name to go with these. We don't know yet if it's a boy or a girl so need suggestions for both.
Thanks

Alex for Boy
Hana for girl (it's Korean for One, grace of God in heyday an, happiness in Arabic, flower in Japanese)

(Always thought my first dc would be a girl, and really liked this name)

Otto
Ivan
Adam

Anna
Iris
Isla
Ruby
Juno

*grace of God in Judaism

Not heyday sorry

Euan/Ewen
Sean
Noah
Alec

Mark, Paul, John, Amos, Noah, Luke, Colm, Evan, Frank, Liam, Stan, Theo,

Anna, Anne, Cara, Cora, Dora, Gaia, Iris, Joan, Lily, Mona, Nora, Rose, Tara, Thea, Vera, Vita, Zara Maya,

I have a Ewan and an Emma

I do like Alex but dh is a big United fan so don't want people to think it's after Alex Ferguson 😆
I like Adam and Anna these were names we had short listed for dc3. I'm not sure about hana cause of the same ending as Dara.
I like Jesi and Cali for a girl but not sure if they look made up to suit the four letters.
I like Zach for a boy but stuck for anything else

Luna
Jess
Milo
Arlo
Ella
Luca
Theo
John
Finn
Maya
Anya

Seth
Leon
Hugh
Saul
Theo
Liam
Finn

Cara
Thea
Lara
Anna
Cate
Leah
Sian

Alec, Jude, Lara, Lucy, Kate, Cara.

Jags, Marc, Luca, Joss, Kane, Sean, Bryn, Hugo

Rose, Bess, Lara, Lily,, Fern, Kate, Lena, Esme

I like this website which lets you search by basically every variable, including number of letters in the name:

www.babynamewizard.com/baby-name/advanced-name-finder

Sean
Colm
John
Rory
Luke
Dean
Jude
Alec
Arlo
Milo
Ezra
Fred
Eoin
Aodh

Mila
Dora
Sara
Lane
Jane
Cora
Emma
Hope
Lucy
Orla
Aine
Emer

Erin, Leah, Dara, and Bart
Erin, Leah, Dara, and Gene
Erin, Leah, Dara, and Jake
Erin, Leah, Dara, and Joel
Erin, Leah, Dara, and Kirk
Erin, Leah, Dara, and Kurt
Erin, Leah, Dara, and Noel
Erin, Leah, Dara, and Otis
Erin, Leah, Dara, and Ross
Erin, Leah, Dara, and Thad
Erin, Leah, Dara, and Toby
Erin, Leah, Dara, and Todd
Erin, Leah, Dara, and Wade

Erin, Leah, Dara, and Alys
Erin, Leah, Dara, and Anne
Erin, Leah, Dara, and Beth
Erin, Leah, Dara, and Edie
Erin, Leah, Dara, and Gwen
Erin, Leah, Dara, and Ione
Erin, Leah, Dara, and June
Erin, Leah, Dara, and Lacy
Erin, Leah, Dara, and Macy
Erin, Leah, Dara, and Nina
Erin, Leah, Dara, and Ruth
Erin, Leah, Dara, and Sage
Erin, Leah, Dara, and Skye
Erin, Leah, Dara, and Suzy
Erin, Leah, Dara, and Zoey

Why does it have to be 4 letters? Why not just choose a name you like, regardless of the amount of letters?

Kira
Iona
Keri
Mary

Gray
Paul
Carl
Kane

Esme

Rory, Ezra

Ella, Rose

Isla
Emma
Ruth

Joel
Adam
Leon

Love Rory.

Faye
Eira

Owen
Jago

Thanks for all the suggestions they really help. I wanted 4 letters because my other 3 dc have 4 letters so didn't want to make this dc different.
I'll sit down with dh and try and make a short list
Thanks again

Eric would be good for a United fan

Not good with Erin though, sorry

Cain
Sean
Paul
Saul
Ivan
Neil
Ross
Finn
Otto
Tilo
Bryn

Rose
Emma
Mira
Nina
Dawn
Gail
Hope
Jean