Sebastian is an ancient martyr's name turned literary, and Little Mermaid hero—think Sebastian the Crab—that's more popular than ever, as a classic-yet-unconventional compatriot for fellow British favorites T Theodore and Oliver.

Helena is one of those classic names that just misses making the US Top 1000 girl names for its entire history, falling off for a single year in 1992. Since then it's been drifting lazily up the charts, and makes a perfect choice if you want a name that both fits in and stands out.

Archie made global news as the surprise first name of the newborn royal baby, son of the Duke and Duchess of Sussex aka Harry and Meghan. Archie has now officially transcended Archie Bunker and Riverdale's Archie to take the, um, throne as the quintessential retro nickname name.

Rupert is a charming-yet-manly name long more popular in Britain (where it's attached to a beloved cartoon bear) than in the U.S. Yet we can see Rupert as a more stylish, modern way to honor an ancestral Robert.

Octavia began as the Latin, then Victorian name for an eighth child. While there aren't many eighth children anymore, this ancient Roman name has real possibilities as a substitute for the overused Olivia; recommended for its combination of classical and musical overtones. It was chosen for his daughter by Kevin Sorbo.

Magical and earthy, sophisticated but off-beat, Persephone appears as the daughter of Zeus by Demeter in Greek mythology. After she was kidnapped by Hades to be Queen of the Underworld, it was decreed by Zeus that she would spend six months of the year with her mother, allowing crops to grow, and six in mourning, thus accounting for the change of seasons. As such, she is both the goddess of the Underworld and of Spring.

Beatrix has a solid history of its own apart from Beatrice, with that final x adding a playful, animated note to the name's imposing history and stately vibe.

Harriet has long been considered a stylish, upscale name in England, but it's still waiting to be revived in the US—though some parents seeking a solid, serious semi-classic are beginning to consider it.

Peregrine is considered to be an elegantly aristocratic name in England, but has never made it to the U.S., where it has been seen as extravagantly eccentric. In the new naming climate, though, it's not beyond consideration — in fact it's already been chosen by at least one Berry.

Quentin, an offbeat name with lots of character, relates to the Latin for the number five and is by far the subtlest and most usable of the Latin birth-order names, masculine as well as stylish and distinctive. It was borne by a third-century saint and came to England with the Normans.

Barnaby, a genial and energetic name with an Irish-sounding three-syllable lilt, is an ancient appellation that manages to be both unusual and highly attractive and deserves to be used more than it is. A sweet-spot name that's a real winner.

Cressida is a pretty mythological and Shakespearean heroine name much better known in Britain than it is in the US. Given to just 7 girls in a recent year, it shares the cool golden meaning of Aurelia, Orla, and Goldie, and offers cute Cassie- alternative nickname Cressie, along with Ida and Sid too.

The Greek name of sixteen popes and fifteen saints, the gregarious Gregory became big in the United States with the emergence of admirable actor Gregory Peck (born Eldred) in the late 1940s. From 1950 to 1973, it was in the Top 30, with nickname Greg becoming a Cool Dude name.

Wallace is so square could almost be ripe for a turnaround, especially with the hipness imparted by the British Claymation series Wallace & Gromit. And Wally makes an adorable Leave it to Beaver retro-style nickname.

Jemima, the name of a strong and beautiful Biblical daughter of Job, has long been among the chicest choices of aristocratic Brits, and has since shifted to be used more generally too, replacing Gemma/Jemma as a way to nickname "Jem". In a recent year, it featured in the England and Wales Top 500.

Dorothea is a romantic Victorian-sounding name that blends elegance, gravitas and a hint of clunkiness too. Popular in the early decades of the twentieth century, it has been off the charts since 1970, however it's definitely on the brink of a revival! In fact, it has already been making its way back into the UK Top 1000, and a recent year saw it given to 90 girls in the US — three times the number it was given to a decade prior.

Marlow is a suave, unusual surname-name that was chosen by Celine designer Phoebe Philo for her older son. This is a name with many spellings and many difference in gender identity. Marlowe is decidedly female, with only 10 percent of the babies named Marlowe male, while Marlow is 25 percent male, and Marlo is evenly divided.

Serena, a name used since Roman times, was given fresh life by tennis star Williams, and then again with the leading character on Gossip Girl, Serena van der Woodsen. There have also been Serenas on soap operas and other shows from Bewitched to Law & Order.

Eulalia is a melodious name with a southern drawl, thanks to those lilting double Ls and similarity to similar Eudora and Eula. Familiar in the US in the early 20th century, it was also a popular choice in Brazil and Spain until the 60s when it fell out of style.

Briony may be the variation and Bryony the original, but many parents will see this as the more authentic-feeling version of this attractive botanical name. Melodic and bright, it was once a Top 400 name in the UK back in the 90s but has since fallen out of favor, as has Bryony.