Otto is cool again. Long a quintessential Old Man Name, Otto has been promoted to trending darling of adventurous baby namers.

Ezra has a lot going for it: the strength of its heroic Biblical legacy, its quirky sound, and its fresh but familiar feel. Ezra is now at its highest point ever, but its intuitive streamlined spelling and deep roots could make it a worth successor to Elijah in the Top 10 -- or even to Liam or Noah at Number 1.

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.

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.

Cleo, one of the few girls' names to boast the cool-yet-lively o ending, is of course short for Cleopatra, the name of one of the most powerful women in history.

Max was derived from Maximilian, a Latin name that originated from the Roman family name Maximus. The character name Max in the children's classic Where the Wild Things Are had an impact on baby namers. Max is a widely used name internationally.

Scarlett Johansson is doing more for this sparky southern name than Scarlett O'Hara ever did. Since the turn of the 21st century, Scarlett has gone from an obscure literary name to one of the most popular girls' names starting with S, right after longtime favorites Sophia and Sofia.

Evie was derived from the English Eve or the Latin Eva, which in turn come from Chawwah, a Hebrew name related to the concept of life. Evie can be used as a nickname for any name that starts with Ev-, including Eva, Evelyn, and Evangeline, but also for names such as Genevieve and Maeve. Evie is typically pronounced with a long E sound, but a short E is also valid.

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.

Zara has multiple origins, but most notably is a variation of Zahrah, a name derived from the Arabic zahrah, meaning "blooming flower." Zara can also be a diminutive of the Bulgarian name Zaharina, a feminine form of the Hebrew Zechariah. Today, Zara is heavily associated with the Spanish fast-fashion empire of the same name.

Kate, in the headlines via Catherine Middleton aka the Princess of Wales, has been as pervasive as Kathy was in the 1950s and 1960s, both as a nickname for Katherine and Kaitlyn and as a strong, classic stand-alone name.

Rhett has been more tied to Gone with the Wind than even Scarlett, but now we're hearing rumblings of its finding new and independent favor among parents, perhaps emboldened by the growing popularity of Scarlett.

Zeke is a casual form of the name Ezekiel, an important prophet from the Old Testament. How well Zeke holds up depends on the boy: it could be a cooler alternative of Zack, or it could prove too close to "geek." Both Zeke and Ezekiel lag behind in popularity on the UK charts.

This lovely surname of the three novel-writing sisters, now used as a baby name, makes a fitting tribute for lovers of Jane Eyre and Wuthering Heights. While the original name took an umlaut over the e, modern English speakers may find that more trouble than it's worth (though big fans of the Brontës may well disagree).

Wolf is a name with a split personality. It can be seen as one of the fierce animal names, like Fox and Bear and Puma, with a touch of the werewolf, or it can be viewed as a quieter, Wolf Blitzer kind of name, fairly common in German (where is pronounced Vulf) and Jewish families, sometimes as a short form of Wolfgang, or even Wolfram or Wolfhart.

The independent Alex has become a classic in its own right. One of the truest unisex names, Alex is used almost equally for both sexes. Alex is used both on its own and as a short form of formal names of both genders, such as Alexander, Alexandra, and Alexis.

As a stylish name, Ryker has three big things going for it: its Ry beginning (as in Riley, Ryder, and Rylan), its two-syllable rhythm, and its er ending. A nice surprise for many is it's "rich" meaning. While this may not be a factor beyond New York City, there is an infamous prison there called Riker's Island. Ryker is one of the trendiest German names for boys in the US.

Annika is a surprise hit of recent years, inspired by golfer Sorenstam; for Trekkies, it was also the name of a 'Star Trek:Voyager' character. Some people's first memory of it might be as Pippi Longstocking's friend. A nice namesake for an ancestral Ann.

The girls have Violet and Scarlet and Ruby and Rose, but for the boys there's a much more limited palette of color names. Grey/Gray is one exception, which could make for a soft and evocative—if slightly somber—choice, especially in the middle. Kaitlin Olson and Rob McElhenney named their son Leo Grey.

Brooke has long projected an aura of sleek sophistication, and can also be seen as a stylish water name.