Dolores Mary Linnéa - Dolores is such a stunning name, classic with a contemporary vibe. Despite the “sorrow” meaning it was also historically considered a seductive name and “the height of sensuality”, which gives it some positive connotations. It also had the meaning of “happy times were to come”. Paired with Linnéa it’s absolutely gorgeous, I’d personally shorten it to Dolores Linnéa, the Mary seems tacked on.
Cecilia Leigh - The assonance of the “Li/Leigh” sound in both names might make this pairing too matchy. I also think both names together sound old. It could be livened up by some of the more modern/spunkier/rarely used names on your list: Cecilia Rain, Cecilia Elm, Cecilia Blue, Cecilia Winona, Cecilia Alanis, Cecelia Lennon, Cecilia Shannon.
Zelda Marie - Stunning. Magical. Classic.
Audrina Rain - STUNNING! Fave on the list. Classic and whimsical, yet spunky and bold. Truly a statement making name.
Heaven Alexandra - So beautiful and breezy. Love the light/virtue vibe combined with the classic name.
Ea Maria - same as Cecilia Leigh, the assonance is a little much. Using names on your list I’d pair: Ea Dolores, Ea Grace, Ea Rain, Ea Alexandra, Ea Aisling, Ea Darach, Ea Blodwen, Ea Siobhan, Ea Hendrix, Ea Anastasia, Ea Lennon, Ea Shannon, Ea Dakota.
Dakota Air - For some reason it’s not quite flowing for me. The “Air” seems like a false start (but I guess it depends on the last name it’d be paired with). If you want to keep the “Air” vibe, what about “Aira” as an alt (pr Air-ruh)? Has multiple meanings such as “the principle of life, the breathe of life, of the wind, respectable, noble…etc”.
Tatiana Bell, Grace Elizabeth, Anna Louise, Emma Mae, Phoebe Hope, Julie Faith, Leah Susanna - while these combos are cute, I think they suffer from sounding too old. Maybe paired with some of the spunkier names on your list could modernise it a bit and give it a cool juxtaposition of vintage flair with modern edge. Sarah Blue on your list is a PERFECT example of this.
Aisling Darach - pairs nicely and has a beautiful meaning.
Molly Tree - LOVE Tree. Very whimsical and gives fairy tale vibes. Flows really well with Molly, albeit short.
Rebecca Winona - beautiful.
Siobhan Lee & Blodwen Jane - spunky and cool
Bonnie Elm - I LOVE this so much! Such a statement. I can imagine a really cool, badass movie character with this name. Both names are feminine yet have this bold strength, simply beautiful.
Hel Hendrix - I see the appeal of both names individually, but as a pair, it’s not catching me for some reason. I think it’s because it ventures into the “too masculine” zone (for me, anyway). To give it some soft energy I might do: Elm Hendrix, Ea Hendrix or even Rose Hendrix, Molly Hendrix, Zelda Hendrix, Audrina Hendrix.
Cáit Eileen - Cute, very charming.
Lux Anastasia - GORGEOUS! Love the light/glow/rebirth vibes. Love that it’s a combination of classic & almost mythical yet spunky and new.
Alanis Lennon - As said above, it’s very musical. Very beautiful.
Jennifer Lily - I almost put this in the “too old” list, but both names truly have a timeless quality to it & still fits nicely in this era that we’re in. They also flow really nicely.
Edit: Noticed some typos days later. Silly autocorrect.