I’m sure we have tons
Chrysanthemum
Rhoswen
Elowen
Elowen came to my mind as soon as I saw your title! That one seems to get discussed on these forums a lot, but it still isn’t in the database.
Girls:
Tesni
Liadan
Boys:
Hallam
There are loads more, but those are the ones that come to mind for me right away at the moment. I’ll probably come back when I think of others.
Adaeze
Christofily
…were two I tried to search but nameberry is sorry, there is nothing matching my criteria 
Pyramus
Definitely.
Siddhartha
[name]Chick[/name]
I find it just as intriguing to see the names that are!
[name]Every[/name] time I write a random sentence and see words light up with links it makes me laugh.
[name]Plenty[/name]!
Holen (female)
Averiah. haha. I call my daughter this, but mostly as a way to annoy my partner because I had to take [name]Zachariah[/name] off my list for boys. It kind of sounds nice, but I’m likely the only one who would ever think so 
Ones from my lists that are missing:
Adrasteia
Aniela
Antonino
Calogero
Gianfranco
Gianluca
Gianpaolo
Mirek
Kestrel (female)
Everdeen (female)
Solace (female)
Saw these on the Bewitching Names blog
Capulet (female)
Kitsune (female)
Solstice (female)
Cho (female)
Kitri (female)
Haiku (female)
Katara (female)
I’m sure there’s a ton of other names on that blog that’s worthy of a Nameberry page, but this little collection comes from merely skimming though the site.
[name]Gerhardt[/name] - sorry. nothing more off the top of my head, but I had to type more since my message was too short!
Emberlynn
[name]One[/name] of my favorites
Truett. It bothers me that it was even mentioned in a post, but is not in the database. And I love this name with the nn [name]True[/name] for a little boy 
Eilonwy - I’m a bit surprised given how many search results from the forum I got.
[name]Gannon[/name] - Ganyn - my cousins name. He is male and uses the first spelling. I’ts Gaelic Welsh. Or both
Siofra hasn’t been added since I last checked, forgive me if I’m wrong.
Also:
Anthem
Evelini
Titan. I mean, if [name]Bloodrayne[/name] can get in, so should Titan!
If [name]Rhodri[/name] and [name]Bleddyn[/name] are in, why not Aled and Gethin?!
Other boys: Tycho (Tychon), Godric, Murdo (Murdoch), Alberic, Carwyn, Wulfric, Alpin, Wulfstan, Petroc, Nicander, Emerick (Aymeric, Amalric), Diggory
Girls: Kinvara, Ornella, Illyria, Ferelith, Everild (Everildis), Ambrosine, Nesrine
Arrowen/Arowen
Fiyero/[name]Fiero[/name]
Gwenelle should be!