Girls Names as Rare as Diamonds

Below are the names that were not used on any baby girls in 2016, and most have never been recorded in the U.S. at all. These are all legit, and many have historical, mythological or literary backgrounds. If you named your child one of the following names, yes it still shows up as unused because the Social Security Administration, for the sake of privacy, only mentions names given five times or more. I have now (as of 5-12-18) updated this list with the applicable 2017 stats.

Abigaia
Acantha
Accalia (suddenly 7 in 2017)
Acrasia
Adamina
Aegina
Aeronwen
Aetheria
Alastrina/Alastriona
Aleydis
Alienor
Alifair, Allifair, Alafare, Alafair
Allegria
Alsatia
Altamira
Aludra
Alula
Amabilia
Amapola
Amarantha
Ambroselle, Ambrosine/a
Amelina
Aminta
Amoret
Anatolia
Anaxandra
Angerona
Angiola
Angiolina
Antalia
Antalya
Aphra
Aquamarine
Aquilina
Aradia (5 in 2017)
Araminta
Archina
Ardith
Argenta
Arianell
Arianella
Arianwen
Aristea (11 in 2017)
Aristella
Armandine, Armandina
Arolilja
Artemesia
Ashera (6 in 2017)
Aspasia
Atalanta
Atira
Aveza
Awilda
Azzurra

Basia
Belisama
Bellona
Belphoebe
Belva
Berania
Bernardine, Bernardina
Betony
Betsan
Bevan (5 in 2017)
Bluebell
Boglarka
Boudicca
Bradamante
Branwen
Brianza
Brigantia
Britomart
Brunelle
Brunissende
Bunny

Cadwen
Caelia
Calcia
Calico
Calluna
Calpurnia
Calvina
Cambina
Canella & Canela
Capella
Capitola, Capitolia, Capitolina
Capucine
Cardea
Carelia
Carissima
Carmenta
Carnella
Carola (5 in 2017)
Casilda
Caspia
Caspienne
Cassiane
Castalia
Catkin
Catriana
Celandine & Celandina
Cenawen
Chandra (16 in 2017, quite a jump from zero)
Charlotta
Chesten
Chestine, Chestina
Chrysanthe
Circe (5 in 2017)
Clarabel (5 in 2017 spelled Clarabell, along with 5 Clarabella and 30 Clarabelle)
Claria
Clarimonde
Clarissent
Claudie
Clelia
Clorinda
Collina
Concordia
Coralia
Coralina (5 in 2017)
Corisande
Coventina
Crescentia
Crisanta
Cura
Cybele
Cypriana

Dagmar
Dalma
Decima
Deianira
Desdemona (8 in 2017, back again from its last appearance in 1994)
Deverra
Dido
Diamanta
Dianora
Diantha
Divinia
Domitille, Domitilla
Doronina
Doveva
Duessa
Dulcibella

Easter (5 in 2017)

Egeria
Elska

Eluned
Elysiana
Emerant

Emerence, Emerentia, Emerencia, Emerentina

Empanda
Endrina
Epona
Eruca

Esmerina
Espiridiana

Eudoxia

Eulalie
Evelisse

Faina

Fairuza

Falena

Farzana

(Fauna 0 in 2017), Faunella

Fenella

Fenicia

Fennia

Ferelith

Feronia
Ffion

Fiamma & Fiammetta

Fidelia (5 in 2017)
Fien

Fifer

Finola (5 in 2017)

Fiorenza
Florizella

Forestyne

Fortuna, Fortunata

Fortunata

Franzia

Freesia

Frostine

Fruzsina

Furrina

Galatea, no Galatia in 2017

Galene

Galila

Garance

Gavia
Gayla

Ghislaine (5 in 2017)

Glausia
Glynis

Godiva (5 in 2017)

Grania
Gratia

Gunila

Gwyneira

Heliabel

Hester

Ingela

Isannah

Iselin

Ismay 

Ismene
Imriska

Ismenia
Ismeria

Isola

Isolda

Isolina
Izola (5 in 2017)
6 Izora in 2016, none in 2017

Jacquetta
Jennet

Jocasta

Juturna

Kasienka

Kasimira
Katalin
Katinka

Kelda

Kerensa
Kilda
Kilmeny
Kinga

Kolfinna

Kollina

Laureline

Leocadia

Lettice

Lilium
Lillias

Lionella
Lise
Lithia, Lithiya
Lore

Loredana

Loria
Lorian

Lucasta

Ludovica

Lunaria

Mafalda
Magnilda

Maibritt

Malvina

Marcellina

Marcheline
Maristella (7 in 2017)
Marzanna
Marzena
Maudeline
Maximiliana (5 in 2017)

Mazarine

Megaera

Meissa

Melisande

Mellonia

Melusine

Micheline
Milda

Miuccia

Morwenna

Musa

Myfanwy

Nausicaa

Nelleke

Nephele

Nerine

Nicandra

Nimue (5 in 2017)

Nineve

Niniane

Niobe (5 in 2017)

Nortia

Odile

Oenone

Oliviera

Ombeline

Orabel

Orfea

Oriane

Orlena

Osa (6 in 2017)

Ottoline

6 Ourania in 2016, 0 in 2017

Paget
Palatine

Palatua

Pamina
Panna

Pascaline

Patelana
Patria

Pax (5 in 2017)

Pelagia (5 in 2017, very exciting)

Pellonia

Perdita

Peregrina

Peronelle
Perrine

Persinette

Petrina

Petronella & Petronilla

Petunia

Placida

Plumeria

Polaris

Pomeline

Pomona

Porrima

Proserpine

Prunella

Questa

Quilla

Quillana

Quitterie

Radomira

Raziela

Rhonwen

Rhoswen
Rixende

Rohana

Romilda

Romola

Ronia (10 in 2017)
Roos

Rosmerta

Roswitha

Roxelana

Rudolpha & Rudolfa

Rudolphine

Rumina

Runcina

Rurina

Ruscella

Sabeline

Sagitta

Salacia
Satia
Satyana

Season (8 in 2017)

Seia

Serenella

Severina

Shalimar
Shera
Siasmin

Sidonia

Signy (5 in 2017)

Silena

Silveria
Sirene
Sissela

Strenia

Suadela

Sylvestine
Syrene

Tamarisk & Tamarix

Tanaquil

Tanith

Thaddea

Thaisa

Thalassa

Thana
Thebe

Tiarella

Tigris

Timea

Tirion

Titania

Tomyris

Tristana

Tristania

Trystine

Tutelina

Ulla (7 in 2017)

Umbrielle

Undine

Ursa (5 in 2017)

Valentia

Valina

Vanadis

Venelia

Venetia (5 in 2017)

Venla

Verina
Verulia

Vibia

Volutina

Willadeen, Willadine, Willardine
Willodean, Willodeen, Willowdean

Xanthippe

Zabel

Zephyrine

*Update: also, none of these Gascon language girl's names were used except for Adelaida, Alaria, Belina, Celina, and Clarie. Most of these unusual French girl's names weren't used either (2016 data in post).