Gender defying

Variant spelling of Indy

The heroic movie figure Indiana Jones was often called Indy, as in the equally testosterone-laden Indy 500 car race. It could also be short for Indigo or Indio, or just use it as is.

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. There were nearly 17,000 baby boys named Jackson -- along Jaxon, Jaxson, Jaxxon, Jaxen, Jaxyn, Jaxsen, and Jaxsyn -- which counted together makes it the Number 3 boys' name.

Aviation enthusiast John Travolta put this fast-paced name in the lexicon when he used it for his late son, and George Lucas followed suit.

Actor Kit Harington, aka the dreamy Jon Snow on Game of Thrones, has given this nickname-name new style and appeal for boys. Actress Jodie Foster used it for her son.

A sweet and sophisticated nickname which feels fresh again after many years in style limbo. For literature lovers, it brings to mind Theodore "Laurie" Laurence from Louisa May Alcott's Little Women. Another famous bearer is English actor Hugh Laurie.

This first name was once a surname derived from Old English. Used quietly a century ago, the current fashion for two-syllable boy names ending in n makes this one a new hit.

More popular in its Layton spelling, Leighton is rising in popularity in the US for both sexes simultaneously, although this spelling remains more popular for girls for now – no doubt helped by actress Leighton Meester. Lleyton – as in Australian tennis star Lleyton Hewitt – is another, even more complicated, variant spelling.

A growing number of high-profile (and other) parents are choosing to honor their musical idols, such as Hendrix, Presley, Jagger, and now Lennon. Lennon first came to notice when Liam Gallagher and Patsy Kensit used it for their son in 1999, and singer-musician Adam Pascal followed their lead in two years later. Thanks in part to female singer and actress Lennon Stella, it's now more popular for girls than for boys.

Lux, one of the light-filled names that include Lucy and Lucian, broke onto the scene as a girls' name but now it's decidedly gender neutral. In fact, at the last count there were slightly more boys named Lux than girls: 140 to 120. But that's pretty close, making this a truly nonbinary name.

Mica is not the same name -- though it sounds the same -- as Micah, but the h makes it feel more masculine.

The bright, playful Micah feels like the middle ground between the safe, solid qualities of Michael and the flair and energy of Luca. Both Biblical and stylish, Micah is proving popular among parents today.

This short form of Mikael, a variation of Michael, may originate in Finland but it's most popular in Germany and The Netherlands. Mika can make a cute and original way to honor a Michael in the family, but be prepared for a lot of people pronouncing it with a long i as in Mike.

Just the kind of old-fashioned nickname coming back into style.

The friendly and sporty feeling Nolan blends some of the best qualities of other popular boy names. With the gentle but energetic sounds of Noah, a hint of the classic Nicholas, and the cool, surname-style vibe of Greyson or Colton, it makes for a familiar and grounded choice.

Nature names like Ocean and River are flowing back into favor, especially with nature lovers and green-oriented parents.

It's a long time now since this casual but suave name was linked to velvet-throated, cardigan-sweatered singer Perry (born Pierino, son of Pietro) Como's day... and this could be the moment for a reassessment. Other Perry associations are designer Ellis and the fictional Perry Mason and Perry White. There is also the option of taking the long way round to Perry via the more substantial Peregrine or Percival.

Peter is derived from the Greek Petros, meaning "rock" or "stone." One of the most important figures in the Christian hagiography is Saint Peter, keeper of the Gates of Heaven. Born Simon bar Jonah, he was given the nickname Peter by Jesus, to signify that he would be the rock on which Christ would build Christianity. Centuries later, there was Peter the Great, the czar who developed Russia as a major European power.