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Araña is a terrible horrible name precisely because it means Spider, and so many people speak Spanish and will be horrified by it. Please don't inflict this on your baby.
If you just like the sound, for the love of God, name her ARIANA instead.
Hmm, I agree that Lennon is problematic on several levels - it does sound masculine. Also it will frequently be misheard as "Lemon" or "Lenin" (ie Russian dictator).
I see your reservations about Sadie - but I love the name itself and I don't think the alliteration is a dealbreaker at all. It's very cute. Isadora with the nickname Sadie is a wonderful suggestion that gives her some flexibility about what name she ultimately wants to go by. And btw I don't know that anyone under the age of 40 would have heard of Sadie Hawkins Day - I'm pretty sure it hasn't existed in a long while.
Also I think Georgia would be wonderful with your last name and is adorable. I wouldn't worry about your mom's associations - they will be quickly drowned out by an adorable little baby. Also Lyra works nicely too.
Re Seren, I'd probably skip it if you don't have a particular connection to the name. It's true she would be forever correcting spelling, and people calling her Erin or Sarah.
Yes, I agree that with kids old enough to know their own name, they deserve to keep their identity - or else should be involved in the process of freely choosing a new name (and then keep their original first name as a middle name.) I would really discourage making this change at the age it seems your kids are - especially not for the sake of the names "matching." The children are not a china set, they are individuals with their own identity. Wait a bit till they get older and may be truly on board with a name change, not just pulled along by your preference.
Normally I love Willa but unfortunately don't think it works with your last name. Of girls names:
Clara, Sura, Josefina are really nice names. I especially like that Sura has a lovely meaning in your wife's language, and that Josefina has a personal meaning for you.
For the boys, many don't seem to flow well with Walker. The best:
Sebastian and Oliver. I'd avoid names with the "k" or hard "c" sound that end up a bit too clunky with the last name.
I'm not a huge fan of geography names. Sometimes they seem like they are "trying too hard."
But Alexa Skye is a lovely name! I say go for it...
Congratulations! Those are beautiful names - I love Arthur and Henrietta both, and the middle names and nicknames are just lovely!
Eg: Dorothy, Delia, or Dora
Adorable for a baby - but do give her a full name, so she can use it professionally if she wants to.... Esp since Dotty also means "a little crazy"....
or Ada. Very charming names
Linnea! or Beatrix! Both are sweet and beautiful and make a lovely set with Willa...
They are both lovely names, but you have to still like them even with a standard American accent, accepting that this is the only way people will ever call them. If the accent you were looking for was in your own ethnic community, you might have a chance to get it right in that setting - but I don't see that in this case.
The best you can do is try to match the spelling to your preferred pronunciation. For Aurelie there's not really a spelling that can get a french sound, so she would just be something like "Oralee"
For Gabriel, try Jibreel. Otherwise his name will be the standard American sound.
Definitely Myla! Short and sweet, very romantic, uncommon but not at all strange. The other two names sound a bit much, but Myla absolutely hits the sweet spot...
For a middle name, Simone
Try Oscar or Hugo!
Great! Congratulations - they are beautiful names
Despite all the surname as first names, I don't think it's a great idea to name a girl with a straight up boys name. It will cause her no end of headache and confusion. How about Elia? Or just Elle?
or Clara Noelle
Great list. I think Josephine is a beautiful name, classic.
For a girl, Carys is a nice name. Calla is very beautiful and I think it would be by far the best of your list, but I am not a fan of Calloway. Reminds me of caraway seeds.
For a boy, try "Shay." Spelling it Shea seems very feminine. Also Nolan is a nice suggestion instead of Leyton.
I would avoid hyphenating the last name. It would just give her a very heavy name all together.