Briallen Faye (Bree-ahl-un)
Davina Camille - Davina does have a certain charm about it, but I'm just not a huge fan. I do adore Camille, however, and these two go nicely together.
Lilla Christine - Are you pronouncing it like Lila, or Lill-uh? I know a Lillya (Lily-uh), and I really like Lily-based names, so this one intrigues me. If you are pronouncing it like Lila, though, it will be very commonly mispronounced, because I want to say it Lill-uh. Christine is pretty but not a personal favorite, though I do think it goes nicely with Lilla.
Esme Brynn - Not a fan of either name here, sorry. They do flow well together, but I feel like the combo is a bit short/abruptly ending.
Briallen Faye (Bree-ahl-un) - Briallen is interesting, and I've never seen it before. I like how it sounds. Faye is really pretty and I like how this short, classic name balances out the unique/uncommon Briallen.
Mia Charlotte - This is my favorite of your girls' combos! Mia is pretty, and I've come to adore Charlotte, especially as a middle.
Rhydian Paul - Not a fan of either name here, sorry.
Harper Allen - Like a handful of others, I prefer Harper on a boy as well (though I do have a newborn cousin Harper who is female). Allen is okay, though I prefer Allan, only because it's a reference to Allan a Dale from Robin Hood. These two names go well together, and the masculine Allen balances out unisex Harper well.
Sebastian Todd - I like Sebastian (especially with the nickname Seb) and Todd is alright but I have an uncle with this name so it's weird for me. I think the T's clash a little, but it's not too bad.
Noah Jasper - I really like both names! They're both handsome and they flow well together, but I can't help but feel like this combo is missing a little something.
Bellamy Robert - I'm not a fan of either name, though just hearing about The 100 has Bellamy growing on me already, though I haven't started watching it yet. I think the B's do clash, though, since B has such a distinct sound.