Why do we hate most girl names...

I like longer names like this, ones that make you go huh, clearly they own their own ponies and luncheon at the tennis club...

You mean like the royal family? The names they use now and historically, Elizabeth, Mary, Alexandra, Charlotte, Anne, Louise, Beatrice, Victoria.

Those are the types of names that truly posh, people use. The poshest family in the country.For example.

You seem to be after Nouveau riche frilly names.
Evangeline
Genevieve
Araminta

If you like Madeleine then I think you need something fairly classic - these are all a bit Disneyprincessa footballers daughter - or trailer park, in reality.

Eg

Genevieve
Verity
Juliet / Julia
Claudia
Imogen
Francesca
Emmeline
Eloise
Helena
Harriet
Serena
Philippa
Adelaide
Rosanna
Cecily / Cecilia
Cassia
Susannah
Saskia

Or if you want a bit more floweryness

Cressida
Fenella
Allegra
Paloma
Octavia
Daphne
Perdita
Seraphina
Tamara
Ianthe
Estella
Georgiana
Clementine
Arabella works here
Alicia (but only produced Ah-liss-ee-ah, if it’s Ah-lee-sha then we’ve left the pony club)

I do like Maryam though, and also Marianne - but they are too similar to Madeleine really

Astrid?
Emmeline?
Saskia?

I have a name that sounds like I owned ponies as a child or my parents were part of the landed gentry. (Neither of which apply) I detest it. Pick something shorter and prettier, take it from one who knows, your daughter will thank you for it. That said Madeleine is nice. Eloise is pretty and sounds similar to names on your list.

A lot of them are quite wafty, OP. They remind of a few women I was at uni with in the early 90s who wore crushed velvet maxi skirts, burned joss sticks and played Kate Bush a lot.

Madeleine is lovely and I really like Elowen from your list, but only spelled like that.

Madeleine and her twenty sisters ..

Elowen
Ellen
Ellinor
Alizee
Philomena
Victoria
Aster
Henriette
Rosanagh
Odette
Cosette
Isabeau
Araminta
Arietta
Allegra
Bridgette
Stephanie
Elouisa
Pomeline
Camilla

Elowyn - isn't it Elowen?
Mairwen - Mare-wun?
Odelia - Delia is nice
Adoette - is it a name?
Adalia - no
Alianna - no
Elliana - no
Mariela - isn't it Mariella?
Alethia - Alicia with a lisp
Maeve - at least it's a name
Freya / Maea - Freya yes, Maea no
Medeina - ???
Moryana - ???
Astraea - ???
Arabella - yes
Mariam - isn't it Maryam?

Most of them are awful.

Primrose
Penelope
Seraphina
Ottilie
Olivia
Francesca

Madeleine & Emmeline
Madeleine & Genevieve
Madeleine & Esther
Madeleine & Sylvie

Davina is actually pretty pony club 🤪

Of your list Arabella works well with Madeleine imo - well known, lengthy with nice nickname options but not overused. I’m not sure about most of the others on the list as they are by and large much rarer than Madeleine and many of them will always have to be spelt out (although I do admit a soft spot for Alethia). Or are the opposite and quite trendy/popular like Freya, Maya and Maeve.

Names that fit your style criteria to me (other than Arabella) and work well as Madeleine’s sister would be names like Juliet, Serena, Josephine, Coralie, Verity, Cecilia, Rosalie, Louisa, Felicity, Claudia and Antonia imo.

I think Arabella works perfectly for your criteria! Eliana and Freya are nice too.

Madeleine and

Anneliese
Cecelia
Camilla
Lydia
Juliana
Felicity
Henrietta
Lorelei
Leonora
Elodie
Annabel
Eloise
Francesca
Gabriella
Natalia
Alicia
Anastasia
Evangeline
Thalia
Lucia
Delilah
Celeste
Cassandra

Madeleine and Collette sound lovely to me.

Not a fan of the names in the op.

Madeleine and

imogen
elodie
giselle
eloise
evangeline
annabelle
isobel
beatrice
clara
henrietta
tallulah
theodora
harriet
rosalie
coralie
romilly
vivienne
ottilie

Clementine! Perfect with Madeleine

OP - None of the names on your list sound like upper-class, that i think you are aiming for. The weird spelling specifically makes it sound like made up names, and wannabes…
Don’t do it to your child. She’ll hate having to always be misspelled and needing to correct people.

You have one traditional longish name - there are plenty in the same genre. Just give it a but of time and look at normal names again.

Madeleine and Penelope
Madeleine and Clementine
Madeleine and Annabel
Madeleine and Henrietta
Madeleine and Georgina
Madeleine and Isabella
Madeleine and Claudia
Madeleine and Josephine

Mariam (or Maryam) is beautiful and underused in my opinion. It fits nicely with Madeleine, close but not 'samey'. Freya is also lovely with Madeleine. Have you considered Harriet?

Xanthe

Georgiana
Henrietta
Victoria
Beatrix
Alexandra
Harriet

Araminta
Camilla
Octavia
Sersphina
Ophelia
Portia
Violetta
Delphine
Jocasta
Allegra
Camille
Tamara

My daughter is called Pippa, we’ve still yet to meet another Pippa. Everyone comments on her name ❤️

It’d be Elowen, Elowyn would be the masculine ending in Welsh.

Pippa