A superlative word name along the lines of Saint, King, Princess, and Chosen, Royal was mostly used for boys — as in Wes Anderson's anti-hero Royal Tennenbaum — until Lil' Kim named her daughter Royal. Reign in 2014. While it was Reign that really took off for girls, Royal also got a boost and entered the Top 1000 in 2015.

Indigo is one of the most appealing and evocative of the new generation of color names. Color names have joined flower and jewel names -- in a big way -- and Indigo, a deep blue-purple dye from plants native to India, is particularly striking for both girls and boys. Although most people don't think of it like this, Indigo might also be considered among the most stylish Greek baby names in use today. Some cultural references: The Indigo Girls are a folk duo, 'Mood Indigo' is a classic Duke Ellington jazz composition, and there is a 1970's New Age theory that Indigo children possess special, sometimes supernatural abilities. Indigo is the name of a character in the Ntozake Shange novel Sassafrass, Cypress & Indigo, and was used for his daughter by Lou Diamond Phillips.

A variation of Greek Dionysius, itself derived from the name of the god of wine, revelry, and dance, Dion gives a nod to mythology while also having historical ties to a student of Plato, to a Greek mathematician and to 1st century writer and historian.

As a contemporary name, it came into popular use in the late 1950s and remained in the Top 1000 until 2006. It has dipped in and out of the charts since then, and is still given to a not insignificant 200 boys each year.

This once unique and multi-layered word name was used by R&B singer Nivea for her daughter back in 2005, and later, by country musician Jason Aldean. No longer an exclusively celebrity choice Navy is now in the US Top 500 for girls and is on the rise in the UK too. As a boys name, however, it remains an unexpected possibility.

Even among the range of blue names on the current baby naming palette -- Blue itself, Azure, Cerulean, Teal, Aqua, Cyan, Indigo -- Cobalt remains the most unusual, not to mention the most masculine.

Sapphire goes waaaaay beyond Ruby and Pearl. This September birthstone, occasionally used a century ago, might be worth a reappraisal, perhaps as a Sophie/Sophia alternative. Sapphire is the pseudonym of Romona Lofton, who wrote the book Push, which was turned into the movie Precious. Sapphire entered the Top 1000 for the first time in 2022, and is proving to be one of the freshest gem names for girls. Another intriguing variation is the lovely Sapphira.

Kalani is a rhythmic name that can be used for either gender though it is predominantly used on girls in the US. With its celestial meaning, and cool K beginning, it only entered the US Top 1000 for the first time in 2015. Now in the Top 400, it joins Kai and Leilani as popular choices with Hawaiian origins.

Celestia is a heavenly name that sounds more ethereal than Celeste, Celestia might make a distinctive, feminine choice if your taste runs toward names like Angelina and Seraphina.

Among the coolest of the cool color names, particularly popular with celebs as a unisex middle name. While most famous as the name of Beyonce and Jay-Z's daughter Blue Ivy, more than 60 percent of the babies named Blue are boys.

This simple yet evocative French word name was chosen for her daughter by model Niki Taylor. While Ciel may be pronounced in French with two syllables, many will pronounce it as "seal" and there may be confusion with Celia and sister Ceil.

Blue suddenly came into the spotlight, as the unusual color name chosen by Beyonce and Jay-Z for their baby girl Blue Ivy. Blue is also a starbaby middle name du jour, used for both sexes in different spellings and forms, from John Travolta and Kelly Preston's Ella Bleu to Alicia Silverstone's Bear Blu. Dave 'The Edge' Evans named his daughter Blue Angel back in 1989.

Once-obscure Spanish name inching back up into the US Top 1000 girl names after a short break. Araceli Segarra is a noted mountain climber.

Even less subtle than Duke or Earl, this name shot up the popularity charts in 2013, the same year young Prince George was born and the craze for all things royal (and Royal) began. Today, it's a leading boys' name on Nameberry's own popularity charts.

Ocean is a nature name that comes right out and states its meaning and association. Full of power and depth, Ocean is one of the fastest-rising baby names for both girls and boys, making the US Top 1000 for both genders in 2021. Oceane, the version that's trendy in France, was used for only 11 baby girls in the US in the same year. Ocean-lovers who want to be less obvious can choose such subtler names that mean ocean as Jennifer or Marissa, but coming right out and using Ocean is a perfectly valid way to go.

Celestine is a pretty, crystalline extension (actually a diminutive) of Celeste that would make a choice that is both delicate and strong. It is also a popular name in France.

Now deeply associated with the gemstone Lapis Lazuli, Lazuli is derived from one of the places where the stone was first mined. The word Lazuli is the root for words like azure. Lapis Lazuli is a deep and rich blue color and was used for pigments and jewellery.

Cyan is a highly unusual blue-green color name, a classmate of Celadon and Cerulean. It does come with the homey nickname Cy.

Sky may be a bit hippie-ish, but it's bright and sunny nonetheless. Sky rejoined the Top 1000 in 2013 after spending many years off the list. Sky was the choice of magician David Copperfield for his daughter, born in 2010.

Azure is a colorful gender-neutral choice, currently used equally for baby girls and boys in the US. It refers to a specific shade of blue seen in a cloudless sky. Elon Musk revealed Azure to be the name of his daughter with Shivon Zilis, twin sister to Strider.

Sky is an ambigender nature name that was first legitimized as the character of Sky Masterson in the 1950 musical Guys and Dolls, played in the film version by Marlon Brando. It's a name we appreciate for its clear, wide-open feel, less hippyish than others like Rainbow and Starlight, and makes an appealing middle name possibility.