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I'd say Lilyella is "real" in that it is a mash-up of 2 more common names. However, my first impression isn't a good one. I initially red it as Lil Yella (as in little yellow). Once I realized what you meant it to be, I was fine. However, I imagine she'll get some incorrect guesses or perhaps some odd looks at first. Perhaps if you did a true double barrell name instead of a mash-up? Lily Ella or Lily-Ella perhaps?
The name does have some negative associations for some people, but Lillith is an option. There is also Lilias, the Scottish variant of Lily. I believe it is LIH-lee-us.
However, while I do prefer for sibling names to coordinate style-wise, I don't think number of syllable really matters much. If what you really want is Lily, I see no reason not to use it. It may be shorter than your daughter's name, but it's still a perfectly good stand along that doesn't need a longer version.
I'm not generally a fan of Louise, but it is my favorite of all your options. I think flow with Maisie is good and the honor component overrides my irrational dislike of the name. FWIW, Louise is a family name for me also, and had I had a girl, it would have been her middle name.
Maisie Clementine would be my next favorite based solely on flow, though I admit that I personally would hesitate to name a newborn after an infant who had died. Maybe that's just me.
Maisie Diana is OK. For reasons of flow I prefer Maisie Diane, but there is nothing wrong with Diana.
Maisie Marianne is just a mouthful for me. If you wanted to use them both, I think Maisie could possibly work as a nickname for Marianne. But that isn't the question you asked. :-)
Eleanor is lovely, and Maisie Eleanor is nice. However, I would opt for a family name since you have several that you seem to like & want to use.
I quite like Miriam's suggestions below. I also agree with her suggestion to just use Kai. It doesn't need to be short for anything. You both like it & it has the same kind of international/travels well feel as some of your other names.
Miriam's suggestions made me think of Dashiel (nickname Dash). I'll also suggest Titus, Hugo, Owen, Julian, Ari, Teo/Theo, Abram/Bram, Tristan, Liam & Felix.
Kairo-is this meant as a creative spelling of Cairo? I'm not a fan of alternate spellings, also not a fan of place names, so I don't really care for this. Seems very trendy, especially with that Kardashian K. Also seems very different from Lucas.
Walker-isn't a bad name, though it's not particularly my style. It fits well with other more modern surname names. With your last name, I could see some possible issues with people reversing the name to Vincent Walker. However, this seems like a fairly minor issue.
Mateo-I quite like Mateo. It's familiar and traditional with a nice international fair. Mateo would travel well. It's not exactly a daring choice, but also not as "bland" as something like Matthew. I think it works well with Lucas.
Sebastian-my feellings on this one are similar to Mateo. It works well with Lucas, though perhaps not quite as well as Mateo.
Ezra-same category as Mateo & Sebastian. Regarding "fit" with Lucas, I'd say maybe it works a little too well. I know more than one family with both a Lucas & Ezra, so they do seem rather predictable together. This isn't necassarily a bad thing, but it is something I notice.
If I had to rank the names in order, I'd say Mateo, followe very closely by Ezra then Sebastian. Walker comes in 4th, but there is quite a gap between 3rd & 4th place for me. Kairo would be dead last, with a huge gap between it & Walker (sorry, I really just don't like it at all).
Have you considered names that have both Persian & English variants? It may mean that pronunciation isn't consistent & you'd have to decide which spelling to use, but it would certainly meet the criteria of "Persian but easy to pronounce in English." For example, Davud/David or Sam.
I'd also suggest looking at Persian names with an English variant that can be a nickname. Examples would include Eksander called Alex or Xander, or Ebrahim called Abe or Abram. You could do this in reverse as well, use an English name with a traditional Persian nickname.
I would also seriously consider if Kian really has to be off the table. How close are the friends? If it's someone in your close inner circle, I agree you may want to pass. However, if it's someone more in your outer circle of friends, or a coworker or something along those lines, I think Kian should still be considered. The origin of the name may also be a consideration. If the friends are not Persian & chose the name for its Irish roots, you could try to emphasize the coincidence of 2 languages coming up with the same sounds as a given name. If they are close friends, I would hope they'd be sympathetic to the difficulties of finding a name that works for both cultures.
I prefer Josephine Mae. I like the somewhat heavy/fusty vibe, and Josie is super cute and less heavy, so you'd get the best of both worlds.
Emily & Emma have both been popular for so long, so Emilee does seem a bit trendy. While you have a good reason for the alternative spelling, I'm generally not a fan of them. Especially if a more common spelling is super popular.
Have you considered combining your names? I think both Josephine Emilee or Josephine Lee/Leigh would work well.
I don't think Harlow really fits with your other girl names. However, I also don't think sibling names have to match.
What do you love about Harlow? If it's the old Hollywood glam feel, perhaps you'd also like Audrey, Ava, or Vivien? If you like the sound, I'll suggest Marlo & Margot.
If you prefer names that aren't super popular, I suggest you check out the Social Security Baby Names website. Depending on how you define "super popular" you could find yourself disappointed in some of your name choices. Several on your boy & girl lists are on the rise. I'll add that of all your girl names, I think Harlow is most likely to feel trendy or date-stamped one day.
I agree that Aiyla is likely to get Ae-lah a lot more often than the confusion with Isla. With Isla, a simple correction of "no, like in Island" should be all most people will need.
You seem to have a short & sweet thing going on, which I rather like. Perhaps Liam, Collin, Henry, Ethan, Reid/Reed, Rhys, Graham, & Leo?
I agree with you that Jessup Preston does sound like Jess Preston. Even without the P last name, I think Jessup would strike many as a girl name. It fits the trend of unisex/surname with a girly nickname. Think Hollis/Holly or Addison/Addy.
If you like Huck, maybe Sawyer? If it's more the sound & less the image, then perhaps Hank, or Henry with Hank as the nickname.
I'll suggest (or 2nd) Colt, Cole, Cash, Zane, Ezekial/Zeke, Clint, Eli/Elias, Wesley/West/Westley, Jasper, Walker, Ranger, Levi, Troy, Wyatt & Ike (perhaps short for Isaac).
I shall 2nd Miriam's comments about the yummy James Garner. I think he was my first celebrity crush, though by that time he was on Rockford files.
I would have suggested all of the names on your boy list! I'll add Henry, Charles & Nathaniel.
Your girl list is also nice, and fits well with Samuel & Oliver. Along the same lines, I might add Violet, Eleanor, Charlotte & Amelia.
Eleanor is a lovely & classic name. It (or variations of it) are used in a variety of languages, so I don't see it being particularly problematic for a mixed-race child. You can take a look a list of languages on behindthename.com, mabe that will help you decide if it will be particularly problematic for your specific situation. http://www.behindthename.com/name/eleanor
Eleanor doesn't really seem all that long to me, so I see no reason why she couldn't use the full form if she wanted. Personally, I'm all about options in baby names. Elle & Ellie don't offer much in the way of options, so my vote would be for the full Eleanor with Elle or Ellie as a nickname. If she ever feels Elle or Ellie are too nicknamey or just don't fit her, she'll have the options of Nora, Nell/Nellie and her full name to fall back on.
I remember you prefer more unsex names from your last post. I wonder if the other parent shares your preference? Personally, I think Eleanor is pretty great for a feminine name. It's not super frilly or princessy, but is still feminine with more "girly" nickname options if she decides she wants them.
As for a more unisex middle, well, no name "defines sex" really. Lots of people prefer some mix of unisex & more gender specific names. Again, this may be for options. If she prefers a more unisex name, there would be nothing stopping her from using her middle name as her call name. A mix of unisex & gender specific is also a nice way to compromise when the parents can't agree which to use.
Are there any surnames from either your family or your partner's family that you might want to use? With Eleanor being from your family, it might be nice to use a surname from the other parent's family in the middle position. Otherwise, I suggest looking for nature, place or word names that have some kind of meaning for you.
Oops! Forgot to add my boy suggestions. For a brother to Grayson & Nolan, I'll suggest Brody, Sawyer, Kieran, Tristan & Sullivan.
I quite like Amelia Ann, and Amelia as a first does seem like the most direct route to an honor name.
I'll add that Norah seems perhaps a bit too similar to use with Nolan.
Andre feels a bit off to me within the sibling group, but if that doesn't bother you, I see no reason not to use it. However, if what you really want is the nickname Anders, why not just name him Anders or perhaps Anderson?
I don't know anything about soccer, and didn't know that either Donovan or Dempsey were the names of soccer players. However, I do know who David Beckham is & the name Beckham is very stronly a soccer name to me. For alternatives, perhaps Beckett or Bennett?
I agree 3 "D" names seems like an intitial theme, especially since all 3 D names are for your boys. I also think Dante & Donovan are too similar. Desmond & Dempsey also seem too similar, at least visually. Dante + Andre make me think you might like something along the lines of Marco, Mattias, or Matteo. Instead of Desmond, perhaps Edmund? Desmond + Andre make me think of Armand.
Ellis isn't bad, but it seems a little too similar to Estelle, though I am easily tongue tied. I do like the idea of 2 D names and 2 E names. See my suggestion of Edmund above. Or perhaps Everett.
If Rome doesn't seem namey enough for you, why not use Roman?
If you like the more Latin sounding names, I see no reason why they would have to be saved for a more clearly lighter complected child.
I suggest going with Ella. It sounds a little more grown up (for when she is actually grown up). Your husband could still use Ellie as a nickname if he wants. I'll add that Ellie & Riley seem really similar to me. Though I admit to being tongue tied easily.
Honestly, in my accent, there isn't really a difference in how Ariel & Arielle sound. I can make myself say arri-el if I try, but otherwise they are the same to me.
If you want a name your husband loves, I would probably go with Ariel (especially if that is his preferred pronunciation). Changing it to Arielle seems like more of a compromise to me. A compromise is not necassarily a bad thing, but that would depend on how your husband feels about the chance I guess.
I agree. A name that seems overdone as a middle name tends to strike me as refreshing when used as a first.
I agree I can see some trouble with the "i" sound, but I think that won't be too hard to overcome. I've had "i" issues with my own name, and most people figure it out after a gentle correction or two.
I know a woman named Alisa & another named Elisa, both say ah-lees-ah, with the S sound you don't want. I suspect some American English speakers will default to the S, so it may also require some corrections.