Sorry for the short comments, I wanted to do all your names.
Florian Oslo - Florian is not a name I would use myself but I do like it, it reminds me of a fairytale (that might me because of Snow White’s prince). I love Oslo it is so fun sounding, and Florian Oslo as a combo is a dream! I would love to meet a Florian Oslo in real life.
Ilya Rafael - Ilya is not my favourite, I think it’s the ill sound. I really like Rafael and that whole family of names. Ilya Rafael does look and sound great.
Santiago Ariel - I knew a Santiago growing up who went by Santi, he was Spanish and I loved his name and I remember anyone who would hear it loving it too. I really like Ariel for a boy, I would sure of the flow at first but the more I said it the more I liked it.
Indiana Lev - I’ve always loved the name Indiana and it has been on my long list for a while for both boys and girls do prefer it for a boy though, I instantly picture a little adventurous Indi with wild hair but also imagine him to be a sweetheart, think it would grow really well too. Lev is a super cool middle name especially paired with Indiana, the flow is perfect and they just make the best name, seriously crushing on this combo.
Caspari Sol - I feel like Caspari is a company or a restaurant because it feels really familiar, I’m not sure about it as a name but I don’t hate it. I love Sol any name meaning Sun in anyway has my vote. This combo screams summer baby who grew up by the beach and has been surfing since they were 3.
Rowan Astrophel - Love hearing Rowan for a boy, I first heard the name used on a male character in a tv show years ago and though it sounded so cool. Astrophel is not a name i’ve heard before so just going of first look, it’s not a name I love, it feels a bit of a mouthful.
Laszlo Valentin - I remember when I first heard Laszlo I hated it but it has really grew on me and feel like any boy would love to be named Laszlo. I love Valentine, Valentina, Valentino but Valentin always feels a bit incomplete to me I think its the tin ending sounding a little harsh when i’m used to the style of names ending in soft vowels. I like the feel of the combo but do prefer Laszlo Valentine.
Arthur Serafim - I love the name Arthur it would be one of my own top choices but I live in England and it is ranked number 3 here. It is such a great name that fits every age and I love the nicknames for it especially Bear. Serafina is one of my favourite girl names so Serafim reminds me of that making it feel a little feminine.
Leonid Iskandar - I’m not really a fan of either of these sorry. I love the name Leo and a lot of it’s longer forms but this just isn’t my style. I’ve never heard of Iskandar before and again just going of first look and sound, it’s not a name I would use.
Casimir Viggo - Casimir is not a name I particularly like but feel I would warm to, Viggo was a name I never really liked to begin with but the more I heard it the more I liked it and I like it a lot now, It’s such a fun name.
Elias Delfin - Elias is a nice name, it’s not one I love but I definitely see the appeal and feels a lot more fresh then all the other popular E names it reminds me of (Elliot, Ezra etc.). The girl name Delfina is a big gp fav of mine and I do like Delfin for a boy and think it really works well with Elias.
Sufyan Theodore - This is again the first time I am hearing the name Sufyan, so I wasn’t sure how to pronounce it or anything about it, I looked up the pronunciation and it was nothing like how I thought it was pronounced, so feel there might be some explaining of how to say it, I do think after telling people though it would be easy for them to say and remember. Theodore was the name I was so certain would be my future son’s name, I’ve loved it since I was 7 and first read it in Little Women, but the rise in popularity has put me off it, I do love it as a middle name though.
Espen Deveraux - I like Espen but prefer Aspen. Deveraux is fun middle name and pairs perfectly with Espen.
Luca Sevastian Rio - Luca is one of my own personal favourites and these middles work great with it, I prefer Sebastian over Sevastian but that’s just me, Rio isn’t my favourite name but I do like it and think it sounds great here.
Eden Rafferty - I prefer Eden on a girl but that just might be because I’ve known a couple of girls with this name and it reminds me of them. Rafferty is a favourite of mine, I know a little boy named Rafferty and know his parents get a lot of complements on his name.
Silvian Dragomir - I don’t like either of these names, sorry. Silvian is okay but I just can’t picture anyone named Silvian. Dragomir and Silvian both feel very fantasy novel to me and I can totally picture someone in Harry Potter with this name just not someone in real life.
Felix Timothy - Felix is another of my own top boy names, I love the sound and meaning. Timothy is again not a name I would use myself I know a few middle-aged men named Timothy and it makes me think of them, but I have heard a few little boys named Timothy recently and I did really like it, it was a nice surprise to heard it being used.
Ruslan Wilbur - I’ve never heard Ruslan before but it’s not one I really like. Love Wilbur though it’s a gp name for me but would love to meet a baby named Wilbur.
Sacha Wolfgang - Big fan of this combo, Sacha/Sasha for a boy is a longtime favourite for me, do prefer this spelling though it feels more masculine than Sasha. Wolfgang is such a good middle name in general but works extra great here, could imagine all ages with this name and all ages loving this name.
Nikolai River - This is a great combo too. Nikolai is a name I love, it is such a great alternative to Nicholas and love the Niko or Kai nicknames. I prefer River for a boy, but feel like it’s a little popular now, works great as a middle especially here.
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Evelina Mavis - Evelina is crazy pretty and such a great alternative to the overdone Evelyn/Everly’s. Mavis is a great name and so ready for a revival. This combo feels like it belongs to a ballerina!
Ainara Valentine - Ainara isn’t my personal style, it is a pretty name just not a name that I particularly like. Valentine in the middle spot is my favourite, love it on a girl. This name flows great.
Marieke Honeybee - Marieke is not a name I had heard before, I did have to look up the pronunciation and I’m not sure if i’m saying right even now, think it would take a few times telling people how to say it before it sticks. I would of loved to have the middle name Honeybee, it is such a fun name but it has such a lovely vibe.
Rosemarin Sylvi - If someone introduced themselves to me as Rosemarin I fear I would hear Rosemary and I think it would happen a lot with this name, it’s a nice name just a little too close to Rosemary. Sylvi is a favourite of mine (but with the e on the end) it has a lovely sound and the meaning of “from the forest” is just lovely.
Vienna Mathilde - Vienna is not a name I particularly like myself but I know a few people who love this name and I do see the appeal, it sounds very feminine and pretty. I really like Mathilde and it works perfectly as a middle for Vienna.
Alma Rosalina - Alma is one of my favourite girl names. I honestly used to get so many strange looks when I would say I liked this name a few years ago but now so many people are liking it, I have had this name paired with so many different middle names over the year and never found the perfect one for me but Rosalina sounds so pretty, at first when just looking at it I thought the -a endings would clash but the sound great together.
Leonie Artemis - Leonie is a recent add to my own list, I love it but now someone with a similar name so can’t imagine myself using it, love it for you though. Artemis is not a name I would ever use so would never have thought to pair it with Leonie, but the sound so good together, I love how these names sound together and they give me strong girl vibes.
Madeleine Anouk - This name is so pretty, Madeleine is such a classy, timeless name that I have loved for so long, again Anouk not a name I would think of but such a great middle name choice.
Elsi Sunniva - Elsi feels a little off to me without the -e ending but other wise a lovely name. And as I previously said any name with a Sun sound or meaning is a winner to me.
Amelie Wednesday - Seriously you have a talent for girl names, Amelie is super pretty and though not a name I love every time I hear it it stops me in my tracks. Wednesday I would use in a heartbeat, I have been crushing on this name for so long now and I am so glad to see others like it too, usually I get strange looks or comments but in my opinion there are worse people to share a name with than Wednesday Addams
Iselina Lumi - Iselina is not a name I would say I like but it is not terrible. Lumi is a nice name but again not one I particularly like.
Lola Franceska - Both these names have been on my own long list for a while. I love Lola it sounds and looks great but I know someone with it so could never use it myself, love to see others use it though. Franceska is a name I would love to use one day probably as a middle too, I know a few Francesca’s so couldn’t use it as a first but it would be a great way to honour some family members, I do prefer the Francesca spelling but thats just me and your spellings super pretty too. Again thought the endings of theses names would clash but they sound lovely together.
Marnie Sunflower - I went to school with a Marnie so it makes me think of her and as a result I had never thought of using it as a name, I still don’t think I would use it but it is a lovely name. Sunflower’s the flower have a bad connotation for me but if I didn’t have that i’m sure I would love the idea of Sunflower for a middle name. Marnie Sunflower sounds ridiculously pretty together.
Lilja Madalena - Lilja is a lovely name and a great alternative to the always popular Lily and getting popular Lila. Madalena is a really meaningful family name for me so I just love it. Again wasn’t sure if the l’s and a’s in these names would clash but they sound great once said aloud.
Zelda Clementine - Zelda is a really cool name, I feel like a girl named Zelda would get so many compliments, it feels like such a strong girl name. Clementine is lovely and a long time favourite of mine, I love it in this pairing.
Mina Pipaluk - Mina I prefer as a nickname for a longer name, it doesn’t feel complete on its own. Pipaluk is not a name I have ever heard before so know nothing about it only that it does sound good next to Mina.
Ines Clover - Again both these names are favourites of mine, Ines is a great name that seems to go a little unnoticed. Clover has many positive connotations for me so I just love. I love this combo I would never have thought to put them together but they sound great.
Alice Lavender - Alice is another name I really like but has bad connotations for me personally, it’s a lovely name though. Lavender I love especially as a middle. These names work perfectly together, I could imagine a designer or star of some kind with this name.
Freyja Daphne - Again another great combination, I personally prefer Freyja without the j but thats just me either spelling it’s a great name with a great meaning and history. Daphne is a name on my long list, It was on my short list but only got knocked down due to me liking other names a little more, Again a super pretty name both on their own and together.
Eska Lorelei - Eska I had never heard before but I do like it. Lorelei is again another personal favourite, instantly makes me think of Gilmore Girls which I don’t think is a bad thing at all and just a super pretty name.
My Favourite of your names are;
Indiana Lev, Felix Timothy, Sacha Wolfgang, & Nikolai River
Evelina Mavis, Alma Rosaina, Amelie Wednesday, Lola Franceska