Second girl....

[Gem176]

Millie and ?????
Surname begins with an M

Millie and Farrah

Ooh, from his maybes I love Rhona! But people in my area call the virus the ‘rona, I don’t know how widespread this is. Isla is lovely, but Ciara is nice and a bit more unusual.

None of the 💛💚 names go with Millie IMO

Isla at a push

Faye is lovely

Ada?
Hazel?
Eva?

Personally I’d avoid another name beginning with M, it’s a bit twee......and it’s nice for siblings to have their own initial they don’t share.
From your list Faye is my favourite. Just so elegant and suits all ages.
Other suggestions -
Millie and
Louisa
Beatrice
Juliet
Kate/Katie
Nancy
Lois
Clara
Pippa
Harriet
Cleo
Poppy

Millie and Maisie sound lovely together but beware of starting an m theme if you are thinking of having more...
Also love Heidi from your list

Maeve
Lara
Heidi
Blythe
Orla / Orlaith
Aurelia (ray as a nickname?)
Felicity (Fliss?)

Faye is my favourite from your list by far though, I think it’s stunning!

If you want to continue the theme of M maybe consider:
Madeline
Mia/ Mya
Maggie
Mackenna
Mimi
Myla/ Mila
Margot
Macey
Martha
Mabel

If you don’t want a name that begins with M, you could maybe consider a name that ends with an I sound:
Hattie
Poppy
Darcy
Esme
Evie
Ruby
Connie

Or if you dont want the name to be anything like Millie, you could maybe choose a name with more syllables like:
Isabella
Abigail
Annabelle
Tallullah
Olivia
Evelyn
Eleanor

Millie and clara
Millie and selena
Millie and grace
Millie and olivia
Millie and jessica
These were all suggested by my 11 year old!!

Millie and Beth (Bethany)