Adonis, used to describe hot guys as in 'check out that bronzed Adonis... For that reason only, I personally wouldn't use this.
Apollo like it but not sure Cordelia and Apollo work together...
Atlas love! *
Balthazar with Cordelia it's awesome, could you compromise with Balthazar nn Bazil? *
Bellerophon, meh there are way better names on your list.
Cecil, ok, I Prefur Cyril, it's less lispy and soft...
Celio I don't mind but again Cordelia and Celio seem quite mismatched to me
Constantine love *
Cosmo yes, I think this could work well with Cordelia
Edmund Love with Cordelia! *
Endymion yes, slightly prefer Edmund but my style is a lot 'safer' than yours so...
Hephaistion, the name is a bit of a mouthful but I know a man with the nn Happy, and that could totally work for this name which gives it extra brownie points!
Isidore love this name! Nelly and Sid, nelly and Is, Nelly and Dory... It works!
Leander/Lysander of the two I Prefer Lysander, both work with Cordelia
[name_m]Leonidas[/ name_m] prefer Lional (I think its the Lion part! Too cool) but its still pretty awesome.
Nestor again Meh
Odysseus/Ulysses prefer Ulysses only for the nn Uly, but don't love either of them, they are both big mouthfuls to say and I can't see nn options that make them more accessible.
Orpheus don't hate it, don't love it.
Paris I think it's gone to place name territory and lost it's Greek legend cred for the vast majority. And unfortunately it's not even elegant, underused place name use...
Perseus/Percival love both, Perseus wins by a wisker *
Phineas yes, Love! Cordelia and Phineas, Nelly and Finn!*
Poseidon ok, Prefur Zeus
Severian, yes although I slightly prefer Stellan
Stanislav very wasten European...
Stellan it's great!
Wilfred makes me think if a little story book mouse...
Zeus Cordelia and Zeus? Can't decide if it works...
Basil as long as its Baz-il
Sherlock I really like Sherlock, but then I also like Gulliver... If Apollo and Zeus can move beyond the one man accociations, why can't Sherlock?
Thaddeus I really like Thaddeus... Most people wouldn't think Theodore I don't think...
Wolfgang I like it, Nelly and Wolf is very cool
Zev, seems very sparse next to Cordelia.
Goodluck, I stared my top 5
Same as your girls list, dividing into likes and dislikes.
Edmund - prefer Edmond
Of your boyfriends favourites...
Basil - only if pronounced Baz-il
Wolfgang - although I once taught a student named Wolfgang and he absolutely hated his name
Sherlock - too much
Again, I've gone for the more "normal" names. But, if you see my comment re Wolfgang, I'd avoid giving your child a very odd name. Although some of them sound lovely, your kid will probably hate you ;)
Perseus/Percival- like Perseus a little more, but both are wonderful
Basil- especially if you pronounce it Baz-il
ones I would eliminate:
Adonis- too hard to live up to
Bellerophon- Belle names are too popular for girls
Edmund- love this, but boring next to your other names
Hephaistion- would be too much hassle, I feel like people wouldn't even try to spell or pronounce it right.
Zeus- Again too much to live up too, but would work great in the middle.
Cornelia Hermione Winter is absolutely stunning. For her brother, I would go with something quirky, strong, aristocratic, and slightly ornate like Cornelia. Balthazar stood out to me immediately. Cornelia and Balthazar as siblings is breathtaking. I also like these as first name options:
I know you said no middle names yet, but these names are too much fun for me not to play with. I keep wanting to put Balthazar and Perseus together. Balthazar Perseus _____ or Balthazar _____ Perseus? Balthazar Leonidas Apollo, Balthazar Endymion Apollo... I'll stop now.
Atlas - Know one, like the name a lot.
Balthazar - Know one, like the name a lot.
Constantine - Know several (Eastern European) very wearable. Feels too Christian for me to use myself though.
Edmund - Adore, highly usable. Like Ned and Ted as nicknames too.
Isidore - I love this. Nobody else does though.
Lysander - Love. Have it on my own long list, Sander for short.
Leonidas - I dislike Leo but like Leonidas and Leonardo.
Ulysses - Really like this.
Phineas - Both Phineas and Finnian appeal to me.