Please critique my long list to help me shorten it ...

My favourites, and with sibling Louisa:

Arthur
David
Nathaniel

Adelaide
Esme
Jane
Jemima
Joanna (also love Johanna spelling)
Judith
Julia
Mathilda
Susannah

Nice bunch of names. Here are the ones I’d rule out if it was me.

Idris - sounds like ‘I dress’, potential for slagging off
Morgan - wouldn’t for a boy, more a girls name

Delia - there can only be one delia!
Ethel - wouldn’t go for this it feels quite old for a little
Isadora - in case 90s whizzadora comes back as a rerun
Jemima - puddleduck
Mabel - think there was a Blue Peter dog with that name
Morgana - sounds like organza, I don’t know just doesn’t sound right
Noelle - slight chance could get slagged off at christmas

Selma - reminds of Simpsons aunt or something

Only critiquing since you asked, you could get off with any really!

Boys:
Arthur - not keen. Still think of it as a bit 'old man'. But it's inoffensive.
David - quite like it but not a fan of Dave and it seems a bit dated.
Gabriel - used to love it. Now know two very irritating ones and it's put me off hugely.
Idris - love it but can't separate it from Elba
Joseph - really like it
Morgan - love it
Nathanael - never seen it spelled like that. Is it the same name as Nathaniel. Love it if it is.
Rowan - love it
Samuel - it's ok. Just know so many that it seems a bit bland.
Solomon - like it. Really like the nn Solly.

Girls:
Adelaide / Ada / Ida / Ayda / Aida - pretty.
Agnes - don't like this at all. Esp if it ends up as Aggie
Celine / Selena - not keen.
Delia - not keen. Makes me think Delia Smith
Emmeline - it's ok.
Esme - really like it
Ethel - sorry, this is one of very few names I actually think is ugly.
Isadora - quite like it
Jane - the ultimate middle name. Seems too plain for a first name.
Jemima - love it. Quite private school? (I teach lots but apparently it's quite rare so I'm thinking it must be more used within that demographic)
Joanna - love it. Think it's underused.
Josephine - like it. Josie is a cute nn
Judith - not keen
Judy - slightly prefer to Judith but still not that keen
Julia - again, one up on Judy but not liking it yet (do love Juliet though)
Lilia/ Lilian /Liliana - I like Lilia and Liliana. Don't like Lilian.
Lina - quite like it. I usually see it written Lena.
Mabel - not keen
Mathilda - love Matilda. Not sure about that h in the middle
Meredith - it's ok. A bit dated maybe?
Merryl - really don't like this at all. Though Meryl Streep is a fab namesake.
Mina - like it.
Morgan - it's ok but don't really like this even though I love it for a boy.
Morgana - sounds a bit like fantasy fiction.
Muriel - Oooh, sorry - another of the small number of names I'd call ugly.
Nathalia - like it. Much prefer Natalie though. Would lose the h
Noelle - like it. Very unusual now too, I'd say.
Rita - not keen. Very dated.
Rowan - like it but much prefer it for a boy.
Sabina/Sabine - quite like Sabina but not Sabine.
Sabrina - it's ok but almost forces me to add 'the teenage witch'
Selma - oh no, sorry - I think this is really, really ugly
Serena - quite like it
Susannah - like it
Talia - really like it
Tina - not keen. Very dated.

I would choose:
boy - Morgan or Rowan
girl - Jemima or Joanna

Can’t go wrong with David. Not so popular atm but a good classic name . A number of years ago it was said to be a name to use to give a good impression to teachers and prospective employers.
Serena and Sabina go well with Louisa.

Arthur - yes
David - love it
Gabriel - love it
Idris - maybe
Joseph - yes
Morgan - no
Nathanael - yes if Nathaniel
Rowan - no
Samuel - love it
Solomon - maybe

Adelaide / Ada / Ida / Ayda / Aida - maybe
Agnes - love it
Celine / Selena - love
Delia - love
Emmeline - love
Esme - yes
Ethel - no
Isadora - no
Jane - love it
Jemima - love it
Joanna - yes
Josephine - yes
Judith - maybe
Judy - no
Julia - love it
Lilia/ Lilian /Liliana - yes to Lilian
Lina - no
Mabel - no
Mathilda - yes
Meredith - love it
Merryl - no
Mina - no
Morgan - no
Morgana - no
Muriel - no
Nathalia - yes
Noelle - maybe
Rita - no
Rowan - no
Sabina/Sabine - yes
Sabrina - no
Selma - no
Serena - love it
Susannah - love it
Talia - no
Tina - no, but I like Kristina

Love Rowan

Oh but I will say one thing. Morgan was one of my favorite names until the other night when I realised it would be automatically shortened to Morg. Which is just awful. Not a nice sound and obviously another way to spell Morgue. Such a shame cause I loved the name Morgan!

Nope. Sorry. That list is too long 😂

Easy.

Morgan/Morgana

From your boys list I like Rowan, Samuel and Joseph.
A lot of the girls list is quite dated. I like Serena, Jemima and Delia and think these go with Louisa.

Boys:
Arthur - yes
David - yes
Gabriel - no
Idris - no
Joseph - yes
Morgan - the organ
Nathanael - did you mean Nathaniel? No
Rowan - not sure
Samuel - yes
Solomon - yes

Girls:
Adelaide / Ada / Ida / Ayda / Aida - no to all of them
Agnes - not sure
Celine / Selena - not sure. Probably not.
Delia - yes
Emmeline - no
Esme - Esmee
Ethel - no
Isadora - no
Jane - yes
Jemima - yes
Joanna - yes
Josephine - yes
Judith - no
Judy - not sure
Julia - too many in my age group.
Lilia/ Lilian /Liliana - no to all of them
Lina - no
Mabel - yes
Mathilda - Matilda. too popular
Meredith - no
Merryl - Meryl. Probably a no
Mina - meaner than who?
Morgan. no
Morgana - no
Muriel - not sure
Nathalia - no
Noelle - no
Rita - not sure
Rowan - not sure
Sabina/Sabine - yes
Sabrina - - not sure
Selma - no
Serena - yes
Susannah - yes
Talia - maybe
Tina - maybe

Arthur and Nathanael (though prefer the spelling Nathaniel) are my faves from that list and the only names that stood out for me for girls are Meredith and Sabrina - I think they are beautiful classic names and would go well with Lousia as would Arthur and Nathanael I think.

Unless you want to save money on sew-in name tapes in a few years' time, don't have another daughter with their first name beginning with "L". It makes it really confusing in the teenage years and beyond when they start getting post from banks etc.

Also chose a name that most parents can spell.

Boys:
Arthur - Nice
David - Also nice, very neutral and unbullyable I think
Gabriel - I love this name myself
Idris - Hard to shorten nicely
Joseph - Nice, a bit boring?
Morgan - May be seen more often as a girl's name now?
Nathanael - like it
Rowan - Like it, also quite unisex now. Goes well with sister's name somehow
Samuel - Nice, but a bit overdone
Solomon - I like it. Possibly bullyable

Girls:
Adelaide / Ada / Ida / Ayda / Aida - Ada's v popular at the moment. Prefer Ida/Aida
Agnes - like it
Celine / Selena - both nice
Delia - nicely different choice, shortens to Dee which is quite nice
Emmeline - OK
Esme - I have one! So a bit biased - it's good as in it's not everywhere but it's also not so rare as to be weird
Ethel - bit too much old lady
Isadora - Nice
Jane - Due a revival
Jemima - bit twee
Joanna - also due a revival perhaps!
Josephine - Nice
Judith - Nice
Judy - Would rather use Judith on birth cert
Julia - Like it, goes with
Lilia/ Lilian /Liliana - Like Lilian most of those
Lina - Not sure I like it
Mabel - A bit too old lady agaibn
Mathilda - Nice
Meredith - Might be bullyable
Merryl - Quite nice
Mina - Nice
Morgan - Like it slightly more for girls than boys for some reason
Morgana - Too witchy?
Muriel - Too old lady
Nathalia - Nice
Noelle - Also nice
Rita - Quite like this
Rowan - if you don't mind the unisexness
Sabina/Sabine - nice
Sabrina - nice, if witchy ;)
Selma - Quite nice
Serena - love this name, husband wouldn't let me have it!
Susannah - Due a revival?
Talia - Very nice
Tina - Not sure I'd name just with Tina, only as shortening of Christina

My top 3 for each sex from your lists would be;

Joseph
Solomon (Sol)
Rowan

Natalia
Serena
Talia

You do have a few names listed that would be “never in a month of Sunday’s” names for me, but the 6 above are all lovely. I have a Louisa & wanted to use Natalia but exH wouldn’t consider it.

Similar names you might like;

Roman
Seb(astian)

Seren
Ivy

Girls names - Agnes (beautiful!), Esme or Talia
Boys - Gabriel, Gabriel or Gabriel! 🙂

Arthur - no way.
David - no
Gabriel - yes
Idris yes
Joseph yes
Morgan horrible
Nathanael ok
Rowan no
Samuel boring
Solomon love it

Girls:
Adelaide / Ada / Ida / Ayda / Aida

Agnes.....no way
Celine / Selena....Selena is lovely
Delia...ugly
Emmeline ugly
Esme ok
Ethel absolutely dreadful
Isadora no
Jane no
Jemima no, pretensious
Joanna dated
Josephine ok
Judith horrible
Judy even worse!!!
Julia ok
Lilia/ Lilian /Liliana like Lilia
Lina no
Mabel no
Mathilda horrible
Meredith horrible
Merryl absolutely no
Mina no
Morgan horrible
Morgana very ugly
Muriel very ugly
Nathalia lovely
Noelle no
Rita what!! Poor kid
Rowan no
Sabina/Sabine horrible
Sabrina no
Selma very ugly, think of the witch trials
Serena love it
Susannah no
Talia lovely
Tina....no way

Boys:
Arthur - yes ish
David - no
Gabriel - yes but popular
Idris - no
Joseph - yes
Morgan - love
Nathanael - like Nn Nate
Rowan - yes
Samuel - everyone knows 5 Samuels
Solomon - no but Sullivan I like nn Sully

Girls:
Adelaide / Ada / Ida / Ayda / Aida - Ida yes
Agnes - like nn Aggy
Celine / Selena - No
Delia - no
Emmeline - yes
Esme - ok
Ethel - makes me smile but only because I think of old ladies - could be cute
Isadora- no
Jane - like - Janey is sweet for younger children
Jemima - no
Joanna - no
Josephine - like nn Joss
Judith - no
Judy - no
Julia - no
Lilia/ Lilian /Liliana - no
Lina - no
Mabel - no
Mathilda - yes
Meredith - yes
Mina - no
Morgan - no
Morgana - no
Muriel - no
Nathalia - no
Noelle - NO
Rita - no
Rowan - no
Sabina/Sabine - no
Sabrina - no
Selma - no
Serena - no
Susannah - susie is nice
Talia - ok
Tina - no

Mina & Rowan are the best
I do really like Mina. Sounds classic and pretty.

Idris and Judith also Morgan/Morgana are really bad.

I really like Morgana. And Gabriel

I like...

Boys:
Arthur
Joseph
Rowan
Solomon

Girls:
Adelaide
Jane
Joanna
Josephine
Judy
Lilia/ Lilian /Liliana
Lina
Sabina/Sabine
Serena

Boys:
Arthur - yes
David - no
Gabriel - yes but worry they may be bullied because of gay aspect
Idris - no
Joseph - yes
Morgan - no
Nathanael - yes nn nate
Rowan- no
Samuel- hmmm dnt like nn sam
Solomon - yes

Girls:
Adelaide / Ada / Ida / Ayda / Aida - no
Agnes- no too old lady
Celine / Selena- yes but beware of Celine Dion and Selena Gomez association
Delia- no
Emmeline
Esme- over it
Ethel- old lady
isadora- love
Jane- plain
Jemima- only just has come back into fashion
Joanna- no dated
Josephine- like
Judith- old lady
Judy- old lady
Julia - like
Lilia/ Lilian /Liliana- like all but lily has become chavvy
Lina- if short for something
Mabel - old lady
Mathilda : yes
Meredith- no
merryl- old lady
Mina- dated
Morgan- no
Morgana- no
Muriel- old lady
nathalia : ok
Noelle: meh
Rita- no
Rowan- no
Sabina/Sabine- no
Sabrina- no
Selma- no
Serena- yes
Susannah: yes
talia- no
Tina- no

Adelaide and Judith are my favourites. Can I add Edith?

Adelaide - hate all variations of this, not my style.
Agnes - I like.
Celine/Selena - don't like, not my style.
Delia - hate.
Emmeline - hate.
Esme - LOVE.
Ethel - too old lady for me!
Isadora - too twee.
Jane - plain.
Judy - too old lady again!
Julia - love.
Lilia - really don't like.
Lina - don't like.
Mabel - love.
Mathilda - really don't like.
Meredith - don't like but it could possibly grow on me.
Merryl- sounds too old lady!
Mina - sounds made up to me personally.

Joseph
Jane