Sibling Name for Maxwell (Boy and Girl pls)

[Lm604]

We are expecting a sibling for my son Maxwell. We want to name his sibling (gender unknown at this point) a name starting with M. So far, our list is very short. Any suggestions would be appreciated!

Girl:
Mika
Meia

Boy:
Milo

Magnus
Moses

Marina
Margot

Meredith
Miranda
Miriam
Melinda

Mason
Morgan
Milo
Maddox

Mia
Mila
Maia / Maya
Millie
Maisie
Mira
Mali
Maeve
Madeleine
Madeline
Matilda
Marcia
Martha
Miranda
Melanie
Melody

Marcel
Miles
Magnus
Marlon
Maverick
Morris / Maurice
Morrison
Malcolm
Milo

May
Mabel
Minna
Maisy
Mavis
Maria

Marcus
Miles
Matthew
Moby
Moses

Macy
Marceline
Merryn

Mark
Malcolm
Micah

Boy
House
Girl
House

Sorry.Misread instructions.

I really like Milo :)

Girls:

Mia, Monica, Margaret, Maja, Maya, Miriam, Marina, Marielle, Marit, Marita, Morag, Morwenna, Marissa, Mapel, Madeleine, Maeve, Margot, Minerva, Mabel, Milena, Mila, Mina, Miranda, Mona.

Boys:

Magnus, Marcus, Michael, Matthew, Manuel, Mathias, Marcel, Marcello, Mark, Morgan, Moses, Mitchell, Micah, Milan, Mirco, Marek, Merlin, Montague.

Mika is a boy's name.
How about Maria?

Marta
Matilda
Mireille
Mira

Milan
Maddox
Marcus

Milly
Matilda
Molly

Matthew
Mitchell
Montague (max and Monty)

You guys are amazing! Thanks so much for all your suggestions.

Of these suggestions, I like:

Mira (but can't go with because this is my niece's name)
Mila (too close to Mira)
Maria (classic and so feminine)
Merryn (not overtly feminine, but very pretty)
Marielle
Milena
Mabel

Matthew (but can't go with this because this is my husband's name)
Miles (prob because it's close to Milo)
Marek
Milan

Also, Mika (pronounced Mee-Ka) is a girl name in Japanese

Are you sure about the children sharing a first initial? It’s going to be confusing for post etc as they get older.