I don’t remember where I got this link, but I believe it was somewhere on Nameberry. WDYT? Any old gems that you like?
Where’s the boy list? 
I like these and think they could work in the modern day:
Abelota
Adelena
[name_f]Adelina[/name_f]
[name_f]Alba[/name_f]
Alianora
[name_f]Alice[/name_f]
[name_f]Alicia[/name_f]
Aliva
[name_f]Alma[/name_f]
Alveva
[name_f]Amabel[/name_f]
[name_f]Amia[/name_f]
[name_f]Amira[/name_f]
Amisia
[name_f]Amya[/name_f]
[name_f]Anabel[/name_f]
[name_f]Anabella[/name_f]
[name_f]Annora[/name_f]
[name_f]Audrey[/name_f]
Avelina
Avelyn
Avina
Ayleth
Babeth
Barbata
[name_f]Basilia[/name_f]
[name_f]Basilie[/name_f]
[name_f]Beatrice[/name_f]
Beatricia
[name_f]Beatrix[/name_f]
Belisencia
[name_f]Bella[/name_f] – obviously
[name_f]Belle[/name_f]
Betrice
I also like these but don’t think they’re as usable:
Aldyet
Aleusa
Ankharet
[name_f]Antigone[/name_f] – pronunciation and stuff
Athelyna – I also like Aethelwine
Baldethiva
Bonajoia
Botilda
Brangwyne
Burghwenna
From this list I would consider:
Adelena/[name_f]Adelina[/name_f], [name_f]Agatha[/name_f], [name_f]Agnes[/name_f], [name_f]Alma[/name_f], [name_f]Alice[/name_f], Amelyn, Ameria, [name_f]Amira[/name_f], [name_f]Anabel[/name_f], [name_f]Annora[/name_f], Avelyn, Avina, [name_f]Cassandra[/name_f], [name_f]Catarina[/name_f], [name_f]Cecily[/name_f], [name_f]Dulcia[/name_f], Edelina. Evelot, [name_f]Eufemia[/name_f], [name_f]Florence[/name_f], [name_f]Greta[/name_f], [name_f]Helen[/name_f], [name_f]Ida[/name_f], [name_f]Idamae[/name_f], [name_f]Idonia[/name_f], [name_f]Idony[/name_f], [name_f]Lena[/name_f], Lylie, [name_f]Mabel[/name_f], Malyn, [name_f]Melodie[/name_f], [name_f]Mirabel[/name_f], [name_f]Oliva[/name_f], [name_f]Olive[/name_f], [name_f]Orabella[/name_f], [name_f]Oriel[/name_f], [name_f]Osanna[/name_f], [name_f]Philomena[/name_f], [name_f]Rosamond[/name_f], [name_f]Rose[/name_f],
Names I think are interesting but probably wouldn’t use:
Edonea, Elviva, Elota, Emoni, Galiene, Gwenhevare, Hawise, Hyssmaye, [name_f]Imanie[/name_f], Imania, Imeyna, Iselota, Kemma, [name_f]Kinna[/name_f], Loueday, Loveday, Merwenna, Odierne, [name_m]Parnell[/name_m], Peronele, Sireda, Somerild, [name_f]Teffan[/name_f], Tibota, Tillot, Udeline,
Here’s some other medieval names I like and think could be used or are harder to be used but could still work:
Girls:
Bozhena
Dionisia
Dragoslava
Iseut
[name_f]Melisende[/name_f]
Militsa
Rohesia
Sunnifa/[name_f]Sunniva[/name_f]
Boys:
Aleksandru
Col
Didacus
Dmitrei
Dragomir
Dragoslav
Dragutin
Elric
[name_m]Geoffroi[/name_m]
Jackin
Jankin
[name_m]Jehan[/name_m]
Jurian
[name_m]Kazimir[/name_m]
[name_f]Nikola[/name_f]
[name_m]Vasilii[/name_m]
Velimir
[name_m]Vladimir[/name_m]
Zvonimir
There are some interesting names on the list! Excluding those that are still in common use today, I personally like:
Amelyn, [name_f]Emelyn[/name_f], [name_f]Isolda[/name_f], [name_f]Sabina[/name_f] and Ysmay.
Though some names are not so nice! Certainly wont be considering Geuecok, Goldcorn, Gonnora, Pogge, Sexburg or Maggot!
Yes this is my third post I’m dumb and just realized there were more lists because alphabet >.< It’s late
So I think these are actually usable (excluding the ones in common use still):
Caesaria
Cassander – but on a boy
Dametta
Dionisia
Dyonisia
Edda
Edonea
Elviva
Emony
Enota
Evette
Heleyne
Idonia
Idony
Isolda
Ivette
Lavina
Love
Loveday
Loveta
Lovota
Orabella
Osanna
Rosamunda
Rosemunda
Ones I personally like but find less usable:
Damisona
Elewys
Elianora
Elwisia
Euphemia
Helvynya
Rametta
Maysaunt
Merwenna
Ossenna
Quenilda
Quenyeve
There’s also a list of names attested before 1250 on that site, but if I keep going this will be SO long. Maybe a new thread for those?