[name]Hi[/name]! Congratulations! Here are my thoughts, although I’m sure more experienced and knowledgeable berries will chime in soon.
With [name]Edward[/name], [name]Adelaide[/name], [name]Isaac[/name] and [name]Oliver[/name]:
[name]Adara[/name] - Too close to [name]Adelaide[/name]
[name]Ariadne[/name] - I like it, but something about it doesn’t quite fit. Maybe a Middle name?
[name]Astrid[/name] - love this name! But I’m not sure it’s the best fit
[name]Anastasia[/name] - I think this would work. It has the same feel as the rest of your kiddos
[name]Imogen[/name] - I think this is also a really good choice! The “i” sound is different from [name]Isaac[/name] and fits into the style you have going with your other 4.
[name]Ingrid[/name] - ditto [name]Astrid[/name].
[name]Isla[/name] - way too close to [name]Isaac[/name] to my ear.
[name]Judith[/name] - yes
[name]Paulina[/name] - yes
[name]Seraphina[/name] - yes
So for girls, I think I like (in order): [name]Imogen[/name], [name]Anastasia[/name], with the runners-up [name]Seraphina[/name], [name]Judith[/name] and [name]Paulina[/name]
[name]How[/name] do you feel about [name]Philomena[/name]? I notice you have [name]Philemon[/name] on your boys list. I think [name]Philomena[/name] picks up the sounds of both that name and [name]Seraphina[/name], and has a lovely nn of [name]Mena[/name] (if you like nns).
[name]Andreas[/name] - like
[name]Amos[/name] - doesn’t really fit
[name]Ari[/name] - doesn’t really fit
[name]Benedict[/name] - yes
[name]Crispin[/name] - yes
[name]Emil[/name] - love this
[name]Isaiah[/name] - too similar to [name]Isaac[/name]
[name]Ian[/name] - too much with [name]Isaac[/name]
[name]Noah[/name] - seems too modern/popular
[name]Nicodemus[/name] - I think this would be a great mn, but maybe too romantic with you other boy names? I think it would make a good twin to [name]Benedict[/name] though
[name]Philemon[/name] - hmm… I can’t seem to love this the way I love the female [name]Philomena[/name]
[name]Tristan[/name] - love
So for boys, I think my favorites for you would be: [name]Benedict[/name], [name]Tristan[/name], [name]Crispin[/name], [name]Emil[/name]
Some combos (with my own suggestion 
[name]Philomena[/name] and [name]Anastasia[/name]
[name]Imogen[/name] and [name]Tristan[/name] I think this is my favorite b/g combo
[name]Judith[/name] and [name]Emil[/name]
[name]Benedict[/name] and [name]Philomena[/name] This is my favorite b/g combo (pending you like [name]Philomena[/name])
[name]Benedict[/name] and [name]Nicodemus[/name]
[name]Bennett[/name] and [name]Imogen[/name]
[name]Crispin[/name] and [name]Paulina[/name]
[name]Imogen[/name] and [name]Judith[/name]
[name]Hope[/name] that helps at all! Good luck!