Lyra Holland and Josette Evelyn "Josie" are 15/10 nuts beautiful. I LOVE these. Josette is an offbeat French name I would love to more of in the States, and I feel similarly about Lyra and Holland. And Evelyn is a solid classic which is super popular right now for a reason. These names are a gorgeous combination of vintage and modern vibes. None of them are unheard of, but you're also certainly not going to walk into a classroom full of ten of them, either.
Brynn is my name and I generally dig combinations of my name.
Brynn Adelaide sounds really good! Good balance of soft and strong sounds.
Ruthanna Louise "Ruthie" feels very vintage in a good way. I tend to find the name Ruth somewhat uninspiring on its own, so I like Ruthanna, and I do enjoy hearing vintage nicknames like Ruthie on teeny tiny kids in 2020.
I like how Riley Augusta looks, and I like both names individually, but there's something about when I say it out loud that they don't quite seem to go together. The names are pretty different in style - a modern unisex name with an old-school feminine name - and I'm just not sure they're best paired together.
I'm not sure if Avonlea is "uh-VON-lee-uh" or "AV-uhn-lee," but either way, Avonlea and Evangelina strike me as too similar in sound to include both in one name. I do like Avonlea Rose or Rose Evangelina, though!
Of your boys' list, I love Alden Henry, Stellan Brooks, and Caspar Grant Hugo! I love your style, in general, and the names which are rare and refreshing yet still heard of. Alden Henry comes across as very sage and wise.
Alaric Owen flows very well together. Like Brynn Adelaide, I like the inclusion of both strong and soft sounds. Ezra August is lovely, too, though I would say the double A sounds might run together a bit.
I feel similarly about Harper Solomon as I do about Riley Augusta - I like both names individually, and I like how it looks written down, but again, the names strike me as very divergent in style (you've got a modern unisex name with an old-school masculine name), and I'm just not sure they flow best together when spoken out loud.
I'm not especially fond of the individual names Emilia, Odette, Emery, and Wilder, so I'll pass on commenting on those.