Congratulations on deciding on your baby girl’s name! What a unique and fierce choice for a little girl. I absolutely adore Cos¡ma’s meaning.
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I believe children’s names should be chosen independently of whether they are singletons at birth or born as a result of a multiple pregnancy. While there is often a greater tendency to coordinate the names of twins, I think the same principles for acceptable combinations apply to any set ofsiblings.
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In the example mentioned, both [name_m]Cecil[/name_m] and [name_m]Clarence[/name_m] would be very suitable choices for Cosima’s twin. The names only share the first letter. Their sounds and spellings are completely distinct. [name_f][/name_f][name_m]Casper[/name_m], on the other hand, feels a bit similar to me. However, I can understand why others might view [name_m]Casper[/name_m] as a great choice for Cosima’s sibling. They are both underused and intriguing C names. I wouldn’t select it myself for a twin set, but [name_m]Casper[/name_m] is not necessarily identical to [name_f]Cosima[/name_f]. They share three letters and a similar beginning, but visually they are unmistakable. Changing [name_m]Casper[/name_m] to [name_m]Kasper[/name_m] doesn’t make much of a difference, and it could even create complications later on, such as having to explain to everyone that [name_m]Kasper[/name_m] is “Casper with a K.” [name_f][/name_f]In this context, unfortunately, the wonderful [name_m]Cosmo[/name_m] would be entirely out of the question for me. Using the masculine variant of [name_f]Cosima[/name_f] would be a little odd for a name nerd. Basically, the twins would have the same name, with slightly different sounds. While most people might not immediately notice the connection, I certainly wouldn’t recommend it. I’ve encountered siblings with extremely identical names in real life, but every new discovery I make still leaves me quite surprised. For example, I’ve met siblings named [name_f]Maria[/name_f] [name_m]José[/name_m] and [name_m]José[/name_m] [name_f]Maria[/name_f] (same parents, part of a large sibling group with a significant age gap); [name_m]Andrew[/name_m] and [name_f]Andrea[/name_f] (twins); [name_m]John[/name_m] and Joanna; [name_m]Mario[/name_m] and Marco; and [name_f]Ana[/name_f] [name_f]Rita[/name_f], [name_f]Ana[/name_f] [name_f]Sofia[/name_f], and [name_f]Ana[/name_f] [name_f]Beatriz[/name_f] (siblings). Honestly, [name_f]Cosima[/name_f] and [name_m]Cosmo[/name_m] could be one of the most acceptable options in this mix of sibsets.
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Turning to your actual list, I have to say I love [name_m]Lucien[/name_m]! It’s such a lively and handsome choice. [name_m]Ambrose[/name_m] is a great match for Sylv@n and Cos¡ma! Have you decided on a middle name yet? [name_m]Lucien[/name_m] [name_m]Ambrose[/name_m] would be an interesting option for your baby boy.
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As an alternative to [name_m]Casper[/name_m], perhaps you might consider [name_m]Jasper[/name_m]? It shares the subtle nature theme found in Sylv@n and Cos¡ma. It’s vintage and very charming. [name_m]Jasper[/name_m] [name_m]Ambrose[/name_m] or [name_m]Jasper[/name_m] [name_f]Florence[/name_f] would be incredible combinations!
I am loving [name_f]Cosima[/name_f] & [name_m]Cecil[/name_m] or [name_f]Cosima[/name_f] & Lucien!! I am not big on twins being matchy, but a a name like [name_m]Cecil[/name_m] works for me because it sounds entirely different, despite starting with the same letter.
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[name_f]Cosima[/name_f] is a stunning[name_f][/name_f] choice! [name_f][/name_f] [name_f]Love[/name_f], love, love [name_m]Lucien[/name_m]!
[name_m]Jasper[/name_m] is a lovely name! I prefer [name_m]Casper[/name_m]. [name_m]Jasper[/name_m] has gotten so popular (can’t believe it’s coming up on the top 100!). I actually loved the name [name_m]Jasper[/name_m] as one of my top names pre-twilight coming out as a movie in 2008 and then took it off the list after that
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I am still torn on his name but everyone’s feedback has been very helpful. I am starting to feel like as much as I love [name_m]Casper[/name_m], in the end I may only use it if we change baby girls name to [name_f]Florence[/name_f] so they don’t match as much. While not entirely off the table, I should stick with [name_f]Cosima[/name_f] to try to make some decisions here and stop perseverating over this every day [name_f][/name_f] [name_f]Florence[/name_f] for a girl is a lot more popular (and rising) than names I tend to like but I can live with that if we go that way.
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As far as middle names… I had wanted to use [name_m]Olin[/name_m] as a middle for baby boy as a nod to where my husband and I met. If we use [name_m]Lucien[/name_m] [name_m]Olin[/name_m] his initials would be LOD which is a nice nerdy nod to a stats term in my field of genomics. But I’m not tied to it.
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For Cosima… if we do an honor name like we like to, it’d be [name_f]Grace[/name_f], which is lovely but also so… common for my typical style [name_f][/name_f] that’s probably what we’ll end up doing. Looking at other names that mean [name_f]Grace[/name_f] didn’t give me any other leads. Open to ideas there. Other honor options are [name_f]Diana[/name_f] or maybe [name_f]Rosalind[/name_f] to honor a [name_f]Linda[/name_f].
Not sure if anyone will see this bump on an old post… but thoughts on [name_m]Marcel[/name_m]? [name_m]Sylvan[/name_m], [name_f]Cosima[/name_f], & [name_m]Marcel[/name_m]. [name_m]Just[/name_m] started pondering this name today and it fits a lot of my checkboxes of soft sounds, international, but familiar in the US… two syllables. I came across it while looking at a list of people involved in the french resistance. Appreciate any feedback!
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[name_f]My[/name_f] husband likes [name_m]Casper[/name_m] the best still but is fine with all the other names we’ve considered. I’m feeling pretty certain [name_m]Lucien[/name_m] isn’t the right choice, maybe as a middle name. But not decided on [name_m]Casper[/name_m] vs [name_m]Ambrose[/name_m] and so I still consider other names I come across. [name_m]Marcel[/name_m] has been intriguing me today!
I honestly think [name_m]Marcel[/name_m] is perfect for you. [name_m]Sylvan[/name_m] and [name_m]Marcel[/name_m] seem made to be brothers. I like that [name_f]Cosima[/name_f] and [name_m]Marcel[/name_m] share some sounds and letters, but feel completely individual.
[name_m]Marcel[/name_m] is a great option! He’s got such a chic international flair that pairs great with [name_f]Cosima[/name_f]! I still absolutely love [name_m]Casper[/name_m] & [name_m]Ambrose[/name_m] for y’all too, though feeling partial to [name_m]Ambrose[/name_m] today.
[name_f][/name_f] [name_f]Love[/name_f], love, love [name_m]Lucien[/name_m]! 
