Acacius is a Latinized form of the Ancient Greek Akakios and can be interpreted to relate to the same root as the name Acacia, for the thorn bush, or Akakios which means "not evil."  With the modern taste for ancient names that end in "us," this obscure but attractive choice may have a chance of new life.  Acacius is the name of three early saints.

Acacius

Altalune is an invention used by Uma Thurman and Arpad Busson as one of several <a href="https://nameberry.com/list/673/middle-names">middle names</a> for their daughter. It's evocative Latin meaning roughly translates to "over the moon." Celebrity baby Altalune will be called the more familiar Luna for short.

Altalune

Wolfgang Amadeus Mozart's middle name could make an interesting pick for music-loving parents--if only in middle place. Amadeus is the title of a Peter Shaffer play which became an award-winning film in 1984.
 German-born tennis ace Boris Becker chose Amadeus for the name of his fourth son.

Amadeus

Ambrosia combines some of the more whimsical qualities of more popular Aurora and Isabella, with a heavenly meaning. 

In Greek mythology, Ambrosia was not a goddess or other figure but literally the food and drink of the gods, said to confer immortality. The Ancient Greek word ambrosios, meaning immortal, gave rise to the Latin name Ambrosius, which became the modern Ambrose.

Only a dozen baby girls were named Ambrosia in the US in the most recent year counted.

Ambrosia

This feminine form of Ambrose has not seem much use in the United States, but it does sometimes appear on the birth certificates of those from Cajun or Creole backgrounds.
 Ambrosine Phillpotts was a British actress whose work spanned four decades during the mid-twentieth century.

Ambrosine

An attractive enough name, but for die-hard Star Wars fans only.

Amidala

The name of the Greek goddess of love has rarely descended to mortal use, though the Roman equivalent Venus, thanks to tennis star Williams, now seems completely possible. But with the new fashion for <a href="https://nameberry.com/list/433/goddess-baby-names">goddess names</a>, we may see more little Aphrodites in the playground with Jupiter and Juno. Nineteen baby girls received the name in the US last year.
 Aphrodite was celebrated by Sappho, the greatest female poet of ancient Greece, in her Ode to Aphrodite.

Aphrodite

Araluen is a beautiful Aboriginal Australian place name, used in several sites, always connected to the dainty water lily. 
In terms of sound Araluen offers it all - the "Ara" beginning made popular by Arabella, the spunky "Lu" sound in the middle, giving rise to great nicknames like "Lulu," and the final "en" sound which makes it fit right in with all those Viviens and Adriennes in the school yard.
Araluen is a great choice for parents looking for a fresh sounding nature-based girls name that isn't too frilly or too masculine.

Araluen

One of Dumas' swashbuckling Three Musketeers, now better known as a men's cologne. 

Aramis

This early Welsh saint's name is unusual and lovely, waiting to be discovered.  Saint Arianell was a member of the Welsh royal family who was possessed by a spirit which was exorcised by Saint Dyfrig, who became Arianell's spiritual teacher.

Arianell

Rarely heard outside of Wales, Arianwen is one of many pretty wen-ending names prominent in ancient Welsh legend.

Arianwen

Artemis, one of the key figures of the female Greek pantheon, is the ancient virgin goddess of the hunt, wilderness, animals, childbirth, and a protector of young girls, later associated with the moon. Artemis is the equivalent to the Roman Diana, but a fresher and more distinctive, if offbeat, choice. 
 Artemis was the twin sister of Apollo, one of the twelve deities who lived on Mount Olympus. She features in three of the fifth century plays of Euripides. The meaning of the name is largely unknown, but it's related to two Greek words meaning safe or butcher, not nearly as lyrical as her mythological story.
 Artemas, on the other hand, is a male name, though some gender confusion could arise from the Artemis Fowl novels.

Artemis

Long more associated with the New York Waldorf- hotel and the neighborhood in Queens than as a baby name, Astoria is finally beginning to emerge from their shadow and find favor with parents looking to move beyond Brooklyn. The name Astoria is drawn from the surname of titan of industry John Jacob Astor, theorized to mean "hawk."

Astoria

Rarely heard in the US, Auberon has a gentle autumnal feel rare in a male name. Possibly starting as a pet form of Aubrey, it was also infuenced by Oberon, the king of the fairies in Shakespeare's A Midsummer Night's Dream.
 The most famous bearer of the name is British journalist and critic Auberon Waugh (whose grandfather was Aubrey and whose nickname was Bron), of the literary Waugh clan.
 The Oberon spelling is another recommended option.

Auberon

Ademir

Alberic

Amadis

Ardalion

Arthwyn

Azuriel

Brioc

Cadmus is the name of the serpent-slaying hero of Greek mythology who also founded the city of Thebes and is credited with inventing the alphabet. Its ancient feel might appeal to modern parents &mdash; especially since Cadmus Peverell is a human Harry Potter character, one of the three original owners of the Deathly Hallows.

Cadmus

Cassiane, also spelled Kassiani or Kasiani, is an ancient Greek name best known as the name of a saint famous as a hymnographer. The Hymn of Cassiane, traditionally sung on Tuesday of Easter Week in the Greek Orthodox Church, is associated with fallen women. The 9th century saint Cassiane was supposed to be in love with the Emperor Theophilos, who rejected her when she proved to be more intelligent than he.
 
Virtually unknown in the U.S., Cassiane may well become more prominent along with the raft of similar names gaining new style currency, from the boys' names Cassian and Cassius to Cassia, Kasia and Keziah.

Cassiane

Castiel, which vaulted into the Top 1000 on the wings of the angel hero of the television show Supernatural, is the name of the Angel of the day Thursday. It may also derive some appeal from the newly-fashionable "Cas" syllable, as in Cassian and Cassius.

Castiel

With a long and noble history -- Cyprian was one of the great Christian Latin writers -- this could make a highly unusual but meaningful choice. 
 Cyprian has been in use since medieval times, initially made known via the third century lawyer, martyr and bishop of Carthage, St. Cyprian, who wrote widely on theological themes...
There was a noted Nigerian writer named Cyprian Ekwensi, and a character named Cyprian in a Louise Erdrich novel, and in Harry Potter, Cyprian Youdle is a Quidditch referee.

Cyprian

Casek

Casworon

Celestin

A name with an ancient pedigree which might prove confusing to the modern ear.

Damiane

Sad tinge to the name of the beautiful German city firebombed during World War II. Its name derives from Sorbian drezga, meaning "forest".

Dresden

A modern Welsh name that will be misunderstood as Irene. 

Eirian

Endellion is the name of an early saint who was a daughter of King Brychan and goddaughter of King Arthur whose life is commemorated by the Cornish village of St. Endellion. This intriguing ancient name was brought into modern usage by British Prime Minister David Cameron, who used it as one of the <a href="https://nameberry.com/list/673/middle-names">middle names</a> for his fourth child, a baby girl.
 
The Latinized form of the name is Endelienta.

Endellion

The name of a mythically handsome youth – loved by Selene, the moon, who bore him fifty daughters.

Endymion

A literary name created by J. R. R. Tolkien for a Lord of the Rings noblewoman of Rohan. Properly spelled with an accent over the first E – Éowyn – it would make an interesting choice for literature lovers or fans of names like Elowen and Evelyn.

Eowyn

Bright and vibrant but elegant too, Estrella is a rising star among Hispanic families that would make a good cross-cultural choice too. A Spanish word name that literally means "star", it is similar to <a href="https://nameberry.com/popular-names">other popular names</a> with the same stellar meaning such as Esther and Stella. 
 
Notable bearers include flamenco singer Estrella Morente and author Estrella D. Alfon.

Estrella

Esylit

Emerence

Enyon

Gamaliel

An unusual Gwyn name with a lovely meaning, this compound name pairs Gwyn with the name Eira, meaning "snow". A relatively modern creation, it remains very rare.

Gwyneira

Galadriel

Gwenllian

Hespera

Illyria can trace all its varied associations to the name of an ancient place in the western part of the Balkan peninsula, also called Illyricum. Its inhabitants, conquered by the Romans in 168 BC, were called the Illyrians. Its mythological ancestor was Illyrius, a demigod and son of King Cadmus and the goddess Harmonia.
 
Illyria also plays a role in literature, both as a place-name and a character name. Shakespeare set his play Twelfth Night in a fictionalized Illyria. More recently, Joss Whedon created a (female) character named Illyria, a powerful "Old One", for his show Angel. And there's a (male) Illyrio in Game of Thrones.
 
Although Illyria sounds like the Italian Ilaria, which means cheerful, it has a different root.

Illyria

Sister of Antigone and daughter of Oedipus in Greek mythology, Ismene's name is unlikely to make it in modern times because of its teasability factor.  Ismay or Esme would be better bets.

Ismene

Ilayda

Ismeria

Isolde

Lienzo

Lorien

The least used of the Three Wise Men's names, but a strong option for bold namers to consider.
 
The exact origins of Melchior are unknown, but it is speculated that it derived from either the Hebrew roots melekh and 'or, together meaning "king of light," or the Persian melk and quart, taken to mean "city of the king."

Melchior

Since Morgan is used as--or more--frequently for girls as for boys, this feminization has fallen by the wayside. It drew some brief attention via the pop singer Morgana King. 
The similar Morgiana appears in Tales from the Thousand and One Nights.

Morgana

Morwenna is an ancient Cornish name now being revived in Wales, deriving from a Celtic word meaning "maiden", although the Mor- syllable means that it's often associated with the sea. It's been heard in the British series Doc Martin and Poldark. Morwenna Banks is a British actress.

Morwenna

Nimue (Lady of the Lake) is the ruler of Avalon in the Arthurian legend. Nimue plays a pivotal role in many stories, including giving King Arthur his sword Excalibur, enchanting Merlin, and raising Lancelot after the death of his father. 

Always an unusual choice, this name went to three magical girls in England and Wales in 2013.

Related names include Nimue, Viviane, Vivien, Elaine, Ninianne, Nivian, and Evienne.

Nimue

Officially a shortening of the traditional and tricky Gaelic Fionnghuala/Fionnuala, Nuala makes a lovely choice all on its own. Nuala is well-used in Ireland.

Nuala

Osias has a Latinate and biblical feel without making an appearance in the Bible. The related Ozias, on the other hand, is a form of Uzziah, found in the Greek and Latin Old Testament, and could make a distinctive path to the nickname Oz or Ozzie--both far cooler, in our opinion, than Oswald.  

Osias

A rarely heard--even in France--name, most prominent as the third name of Charlotte Marie Pomeline Casiraghi, the daughter of Princess Caroline of Monaco and granddaughter of Grace Kelly.

Pomeline

Remiel

Romaric

This ephemeral name of the loving angels surrounding the throne of God is all but unheard of in the US, although its feminine forms Seraphine and Seraphina are catching on. In Russia, it's long been in use, spelled Серафим (Serafim).

Seraphim

Seraphine is the Gallic version of the angelic name Seraphina. But while Seraphina has been rising rapidly since Jennifer Garner and Ben Affleck chose it for their second daughter, Seraphine has been largely ignored, though we believe the French vowel-sound ending will soon be more stylish than the a-endings that have predominated in <a href="https://nameberry.com/girls-names">girls' names</a> for years.

 Another cousin, Seraphita, is the heroine of an eponymous 1837 Balzac novel.

Seraphine

Summerine

Ursula, while beautiful, still carries a whiff of the Disney sea witch. Perhaps Ursuline smells a bit sweeter?

Ursuline

This name of a Roman emperor and of a sedating plant doesn't have much of a baby name future, unless you just like its strong, rhythmic sound. 

Valerian

Said to refer to either Jupiter or Venus, either of which would be preferable as a name. 

Vespera

This name feels warmer and more human-appropriate in its longer version, but still retains that breezy feel. Trivia tidbit: Zephyrinus was a Jewish pope. 

Zephyrin

Zephyriel

columbiacharm's list "Over The Top" of 68 great name ideas: Acacius - Zephyriel!