AEON

AERO

The first letter of the Greek alphabet ande the brightest star in every constellation, this would make an interesting choice for a first daughter, though it does give off some spectral sci-fi reverberations--and references to the term "alpha male.". 

Alpha

One of the stellar unique baby names from mythology, Andromeda was the beautiful daughter of Cassiopeia who, like her mother, literally became a star--the constellation that bears her name.The Bohemian Andromeda makes a dramatic and adventurous choice in a time when four-syllable mythological names are gradually making their way into the mainstream.
 Andromeda Tonks (nee Black), is a Harry Potter character
 Cousin name Andromache belonged to the tragic wife of the Trojan Hector, appeared in Shakespeare's Troilus and Cressida and was the subject of plays by Euripedes and Racine.

Andromeda

Anki

ASCENSION

ASTALA

ASTRO

ATOM

AURISTELLA

Cassiopeia, the name of a mythological mother who became a stellar constellation, is challenging but intriguing, and has all those softening Cass nicknames available. And with all names Cass-related trending, Cassiopeia may be an unusual route to a stylish name.

With the rise of other otherworldly and mythical choices, from Apollo to Jupiter to Juno, Cassiopeia may just feel more possible for mortals now than ever before in its long history.

Some sources say the meaning relates to the cassia berry or tree, and may be "cassia juice," making this a botanical as well as a mythological name.

Cassiopeia

Forget the oil. It's one of the twins that make up the constellation Gemini, and a mythological name on the cutting-edge of fashion; used by Metallica's James Hetfield. 

Castor

Like Sky and Sunshine, this fluffy name from the hippie 1970s has floated back onto the naming radar. 

Cloud

COMET

We all heard it on Seinfeld as the long-concealed first name of Kramer, then considered a punchline. Now some pioneering parents are embracing this expansive Greek name, which makes a creative and cool choice for a baby. Influential celebrity couple Scarlett Johansson and Colin Jost chose it for their son, born in 2021, which will likely drive Cosmo up in popularity. In the UK, it currently ranks within the Top 1000 boy names and is trending upwards.

 In literature, Baron Cosmo Bradwardine is a character in Sir Walter Scott's novel Waverly and Cosmo Topper is the befuddled banker in Thorne Smith's humorous novel Topper. In modern times Cosmo has become the short form for Cosmopolitan – both the magazine and the cocktail. And for those wishing to honor a medic in the family, Cosmo is also the name of the Arabian-born patron saint of doctors.

Cosmo

Adventurous word choice, but still quite a burden for a child to bear. 

Discovery

DRACIEL

An early African-American name, along with variation Eartha.

Earth

EVENINGSTAR

Future

GALAXY

After Leo, this is one of the most usable names in the zodiac: part ancient, part new-age, part high-tech. In the night sky, the constellation Gemini is present all year round in both hemispheres. It has been associated with twins since ancient times, and its two brightest stars are named Castor and Pollux after the twins of Greek mythology. It also has STEM connections: Project Gemini was a NASA spaceflight program before Apollo.

Gemini

More familiar to English speakers in the Italian Elio form. 

Helio

IDALION

Io may be one of the slightest names in the book, but there aren't many two-letter names with as much substance as this Greek mythological example.  Io, a name used for the largest moon of Jupiter, was in classic myth raped by Zeus and escaped from him by changing herself into a cow. 

JUPITER

Kai is an internationally flexible name with many possible origins and meanings, growing in popularity in the US and a diverse range of European countries.
 
In the US, the name Kai is most commonly referred to as being of Hawaiian derivation, meaning "sea." In Europe, Kai is largely considered to have Frisian origin as a diminutive of the name Kaimbe, meaning "warrior", or as a short form of Gerard "brave spear". 
 
Kai is also found as an independent name in African, Chinese, Turkish and Native American cultures. Kai is a strong, evocative multi-cultural name that packs a lot of power in its single syllable. 
 
Famous as the name of the boy enchanted by the fairy-tale Snow Queen, Kai was chosen for her son by actress Jennifer Connelly and as a middle name for son Samuel by Naomi Watts and Liev Schreiber. 
 
Kai is popular with Berries as both a first and middle name choice. Perhaps because of its international familiarity, Kai is popular in video games. Its most prominent namesake is Danish-born jazz trombonist Kai Winding.
 
Kai ranks in the US Top 1000 for girls, but is used more than 90 percent of the time for boys. Donald Trump, Jr. has a daughter named Kai Madison and Gigi Hadid and Zayn Malik named their daughter Khai in 2020.

KHEPRI

KNOWLEDGE

Leo is a strong-yet-friendly name that was common among the Romans, used for thirteen popes, and is now at its highest point ever in the US thanks in part to Leonardo "Leo" DiCaprio.

Derived from the Latin meaning "lion", Leo is one of those names, like Luke and Finn, that many people assume must be short for something but that is authentically a complete name in its own right. That said, Leo can but short for any number of names, from Leonardo in Latinate languages to Leon and Leopold in Germanic languages. We've even heard of little girl Leonoras and Leonies called Leo: How cute is that?

Leo's simplicity makes it an international star, ranking in the Top 100 in countries as diverse as Ireland and Israel, Spain and Sweden, Austria and Australia. Leo is a truly diverse name, a perfect choice for any family crossing countries or blending cultures.
 
Leo's only real downside is its universal popularity and familiarity. If you call your child Leo, you and they will almost certainly encounter many other Leos over the years of all types and ages. Plus or minus? Or both?
 
Penelope Cruz and Javier Bardem called their son Leo, as did actress Kim Raver, NASCAR driver Jeff Gordon and Kristin Olson. 
 Famous Leos of the past include Pope Leo the Great, a number of early saints, and Leo Tolstoy, as well as Dead End Kid Gorcey, colorful baseball manager Durocher, influential gallerist Castelli and the leonine MGM icon. There have been Leos seen on everything from The West Wing to Charmed to Grey's Anatomy to Seinfeld's Uncle Leo.

Appropriate for a girl born between late September and late October, Libra suggests both balance and freedom. 

Libra

The name of the Roman god of war began to sound less intimidating when Erykah Badu gave it to her daughter, and musicians Thomas and Bruno Mars (the latter born Peter Hernandez) have given it a modern edge. Mars actually could make a pleasant, planetary middle name for either sex.
In Roman mythology, Mars was the god of not just war, but also agriculture, and was more down-to-earth and less cold and ruthless than his Greek counterpart Ares. He was considered a father of Rome, as he was the father of mythical founder Romulus.

Mars

MARSTELO

MEMSTARA

Adventurous parents are starting to look back to names of ancient gods like Mercury, Zeus, and Apollo. This one is also a planet and a metallic element, and has a friendly nickname, Merc. The Roman god Mercury, which derives from the Latin words for trade or wages, is the patron of tradesmen and travelers and the fastest-moving planet in the solar system. Mercury is the planet associated with the sign of Virgo, so this is one of the prime <a href="https://nameberry.com/blog/zodiac-baby-names-ideas-for-your-virgo-babe">names for Virgo babies</a>.

 Music lovers will also appreciate the connection to the legendary Freddie Mercury, born Farrokh Bulsara.

Mercury

MILLENNY

Adventurous parents are venturing deeper into the garden in search of fresh names, but remember that this also makes for an alcoholic brunch. 

Mimosa

MOON

MORNINGSTAR

Orion is a rising star, with both mythical and celestial overtones.
 The Greek mythological Orion was the legendary hunter who pursued the seven daughters of Atlas, was slain by the goddess Artemis, and then placed as one of the brightest constellations in the night sky by Zeus.
 Mark Twain had a brother named Orion, and Chris "Big" Noth picked the name for his son. It is also a Harry Potter name.
 Orion's Gaelic connection to O'Ryan/Ryan makes it familiar as well as unusual.

Orion

Castor's twin in the constellation Gemini. That final x makes this name modern and cool. 

Pollux

Quintessence

Race

SESHETA

Most parents today would prefer the softer-sell Stella. But Star has symbolic power related to Christmas, so this could make one of the perfect <a href="https://nameberry.com/list/577/names-for-december-babies">names for December babies</a>.

Star

STELLAMARI

Sunniva was an Irish-born saint who fled to Norway, where she hid in an island cave with her followers and eventually died.  After miracles were reported on the island, the cave was excavated and Sunniva's intact body was found.  Sunniva is the patron saint of Western Norway.  Her name would make a fascinating and unusual choice for a modern baby girl, and if her story is a bit grim, you can take refuge in the upbeat nickname Sunny or Sunni.

Sunniva

SYFY

THEBE

Twyla

The name of a heavenly planet and the Roman goddess of beauty and love was an intimidating no-no until tennis champ Venus Williams put an athletic, modern spin on it. 
 
Associated with the Greek Aphrodite, in the Roman pantheon, Venus (whose name probably means "desire") was considered the mother of the Roman people and has always been a favorite subject of artists — most well-known being the prehistoric sculpture Venus of Willendorf, the ancient Venus de Milo and Botticelli's The Birth of Venus.

Venus

ZANIEL

goddess_patreice's list "Outer Space Names" of 52 great name ideas: AEON - ZANIEL!

Outer Space Names

Stellar boys' and girls' names straight from the stars, the plannets, and beyond.