This old man nickname feels remarkably fresh when applied to girls. The cutesy -ie spelling makes it feel very feminine. Use it as a short form of Lena, Helena, Magdalena, Lennon or Lennox. The pan-European Leni is identical in sound yet feels a little lighter and fresher, and is a fashionable favorite in Germany.

Cosy but cool, Archie has been a favorite nickname for boys in the UK since the 2000s. More recently, it re-entered the US Top 1000 after a 30 year absence and saw a big rise after Prince Harry and Meghan Markle chose it for their son in 2019. As a girl name, it has been occasionally used, albeit rarely.

Mickey is a nickname-name redolent of the mid-20th century and best-known as a mouse name. While this spelling works for either gender, the girls' version is more often spelled Micki.

Marty and Martie are old-fashioned gender-neutral nickname names, boyish nicknames not heard much since the middle of the last century. That could change, though, with the rise of vintage boyish nicknames for girls. They have a certain charm and may come back into style along with mother names such as Martha.

Short for Rocco or perhaps Rochelle, this bold nickname has a more peaceful meaning: "rest". But it doubles up as a word name with a wild and edgy sound – especially for girls.

An old-timey boyish nickname that works as a diminutive of Leona or Leonie, Alondra, Lorna or any female name with strong L and N sounds.

Sounds a bit like a shortening of Rafael or a condensation of Rafaela, but Rafa is a name in its own right. Whether you use it as a full name or a nickname, Rafa's casual coolness could allow it to follow in the footsteps of other tomboy names for girls, like Billie and Scout.

One of the earliest of the relaxed, unisex names, now relegated to oldies rock stations. Ricki is a spirited, retro nickname traditionally short for Frederica but now stands strong on its own. Notable bearers include talk show host Ricki Lake, giving it a bold, independent vibe.

Perrie, a soft and playful twist on Perry, gained attention through Perrie Edwards, singer of the British girl group Little Mix. With its sleek -ie ending, Perrie fits right in with rising unisex names and stylish picks like Frankie and Stevie.

One of the trendiest names for boys, Jax is becoming familiar on the girls' side through the singer/songwriter and Tiktok star Jax, born Jackie.

This grandpa-esque nickname, traditionally short for masculine names like Osmond, Oscar, or Oswald, is starting to get traction on its own, thanks to its cool, zippy sound. In the Top 1000 for boys in the UK and the US, it given to almost 550 American babies in 2024, 60 of them girl. And Jack Osbourne gave it celebrity cred when he named his newborn daughter Ozzy after his late dad.

Willie is one of the adorable boyish nicknames newly fashionable for girls, rarer than Billie. It definitely makes the somewhat-fearsome Wilhelmina more fun and approachable.

Spiky and playful, Mikey could fit in with Stevie, Scottie, and Charlie as a boyish nickname for girls. It might work as an updated honor for a Michaela, a Michelle, or a Michael, or as a rarer alternative to Frankie, Miley, and Micah.

Ties to the unfortunate Mama are now unraveling, leaving Cass or Cassie to stand on its own as a fresher sounding Cathy or Kate. With gender-neutral names abound and the growing trend of boyish nicknames for girls, Cass may be on the up and up.

Boyish nicknames for girls are in! With Leni rising, Bennie may appeal. Kylie & Jason Kelce use Bennie as a nickname for their third daughter - full name Bennett Llewellyn. After decades of no recorded usage, Bennie is now given to about 30 baby girls per year.

In the age of Billie and Charlie, Eddie seems like a plausible option for a girl – short for Edwina, Edith, Eluned or any girl name containing the letters E and D.

Short and simple Ty could work as an alternative to Kai or Sky, or as a short form of Tyler/Tyla or Tyra.

Cool a few decades ago, along with Lori and Tori. Currently out of fashion but may make a retro tomboy choice as an offbeat spin on Charlie.

This zippy diminutive name has been rising up the charts in recent years as a cool unisex choice. The Ozzy spelling is currently more popular all round, however for girls the Ozzie spelling isn't too far behind. It was given to around 50 American girls in 2023, while Ozzy was chosen for 70.

Sweet old-school nickname name currently trending for boys in the UK, but could also be short for Alba, Alberta or Albertine. Part of a growing trend of using boyish nicknames for girls, Albie could be the next tomboy name to hit the playgrounds.