Jack may have fallen from its Number 1 place in England, but in the US it's as popular as it was at its height in the 1920s and 1930s. A durable, cheery, everyman form of John, Jack ranks as one of the most popular boy names starting with J.

With international flair and elegance, Sebastian is a saintly, Shakespearean and Disney-inspired choice: refined, classic-yet-unconventional, and totally in tune with other popular choices like Theodore, Oliver, and Alexander. Recent data has seen it rank in the Top 20 in the US, while across the globe it sits in the Top 100 in England and Wales, Czechia, The Dominican Republic, New Zealand, Austria, Norway, and Puerto Rico.

Hudson has risen quickly up the charts over the past 30 years, getting a lot of its style value from New York's Hudson River. That makes it a nature name and a place name that's also got the fashion gloss of New York City.

Samuel has been so popular for so long that it's hard to believe it's still climbing, at its highest point since the 1890s.

Nora is a lovely, refined name that conjures up images of Belle Epoch ladies in fur-trimmed coats skating in Central Park. Long seen as a quintessentially Irish name though its roots are not in Ireland, Nora is a quietly stylish favorite that's tiptoed to the top of the popularity ladder.

The genial yet upscale and preppy Cooper was one of the first occupational last names to catch on -- and Cooper remains a pleasing option.

Isla is a hit name throughout the English-speaking world but hasn't found the same popularity in other western countries, perhaps because its spelling and pronunciation don't make sense for those whose native language is not English. Think island without the final two letters.

Ella is a sweet, simple name that owes much of its current popularity to the popularity of other names, from Emma to Bella to Emily to Ellie.

Zoe is one of those surprising names that has been on the Top 1000 nearly every year since 1880, but it's only since the turn of this century that it's ranked in the Top 100.

Jackson is one of those names that's much more popular than you think, coming in near the top of our annual Playground Analysis, which ranks names by grouping all their spellings together. Last year, more than 13,000 baby boys were named Jackson -- along Jaxon, Jaxson, Jaxxon, Jaxen, Jaxyn, Jaxsen, and Jaxsyn -- which counted together makes it the Number 5 boys' name.

Mason is an occupational surname that ranked among the Top 10 name for boys throughout the 2010s, after its choice as one of the first Kardashian baby names. It remained a Top 10 choice in the US until 2020 when it began trending downwards and a recent year saw it rank at #42, the lowest it's placed since 2005.

Miles, which has a permanent veneer of cool thanks to jazz great Miles Davis, is a confident and polished boys' name that's an American classic. Always ranking in the US Top 1000, it's been drifting up the charts for the past half century and now ranks at its highest point ever, in the Top 50.

Isaac has shaved off his biblical beard and leaped into the upper echelon of popular boys' names, outrunning cousin Isaiah. A favorite of the Puritans, Isaac has never dipped below Number 400 on the US list of top boy names.

Riley—an upbeat, friendly surname name—is red hot for girls and still going strong for boys. If you haven't been spending much time around babies recently, you may be surprised to learn that Riley is the most popular girls' name starting with R and also the Number 1 Irish name for girls in the US.

Strong but sweet, Leah is a classic name that doesn't feel dull or dusty. It's got plenty of dignity, grace, and pluck, making it a solid choice in the 21st century.

Clara is a strong, lovely girls' name that's always ranked among the US Top 1000 girl names but has been climbing since the turn of this century. It now ranks right at Number 78, making it a modern classic that's neither too popular nor unfamiliar.

Everett is a preppy but outdoorsy name, with wintery New England vibes. In the last decade, it’s had a leap in popularity, perhaps because of its similarity to trendy girls’ names like Ava and Scarlett, or perhaps because it offers a fresh alternative to 90’s style Evan and Brett.

A classic in its native Scandinavia, Axel has a cool rock 'n' roll flavor in the US, thanks to Guns N' Roses' Axl Rose (born William). With its distinctive letter 'x', it has an effortlessly cool vibe about it, and is currently growing in popularity.

Madeline, a lovely name with a soft and delicate image, is an old-fashioned favorite that returned to favor in the 1990s, combining a classic pedigree with a cute nickname option: Maddie.

Lydia is one of the first place names, after an area of Asia Minor whose inhabitants are credited with strong musical talent great wealth. Always among the US Top 1000 girl names, Lydia is a quietly fashionable classic.