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.

Kit is a crisp, old-time nickname with plenty of spirit and style. In the UK it's a rising star for boys, while in the US, it is trending upwards for girls too.

Gus is a homey grandpa nickname name that can work as a short form for any of the above or stand on its own as a cutting-edge replacement for Max and Jake--though it was off the Top 1000 from 1978 until 2016, when it squeaked in at Number 999.

Cal is a nickname style name that feels as friendly and calm as it does cool and breezy. While its longer forms have proved more popular over the years, Cal as a stand alone has dropped on and off of the US Top 1000 since the 1880s.

Ben, the diminutive of Benjamin or Benedict, can easily stand on its own as a simple, strong, nice-guy choice, though it's somewhat attenuated. Ben is this generation's Bob or Bill.

The original Pip was the main character in Great Expectations (full name Philip Pirrip). Cute for a tike, maybe too cute for an adult.

In Ireland and Scotland, Mac and Mc mean "son of"; here, Mac is a generic fella, or a short form cooler than either Matt or Max. Mac can be a nickname of any longer Mac or Mc starting name such as McCoy or Macalister. If you want to make it feel more complete, you can always spell it Mack.

Like Ed, Eddie and Teddy, Ted is rarely used as an independent name – in the US, at least. In the UK, Eddie ranks just outside the Top 200, Teddy ranks just outside the Top 30, and Ted is a Top 200 pick.

Cross-cultural winner.

Short but spirited, Pim is in the Top 200 in The Netherlands, though it is little-known elsewhere. A diminutive of Willem (or William), it possibly emerged via its rhyme with alternative, more direct short form, Wim.

Jen is a short, crisp feminine name that originated primarily as a diminutive of Jennifer, though it can also be a nickname for names like Jenna, Jenny, or Genevieve. The root name Jennifer comes from the Welsh 'Gwenhwyfar,' meaning 'white wave' or 'fair spirit.' Jen gained independent usage during the 1970s and 1980s when Jennifer was at peak popularity, with some parents choosing to put just 'Jen' on the birth certificate. Its simplicity and directness appeal to those preferring unpretentious, straightforward names. While Jen's popularity as a stand-alone name has declined since the 1990s, it maintains appeal for its brevity and friendly, approachable quality. The name carries a casual confidence and remains recognizable without being overly common as a formal name.

Tim is a boyish short form occasionally given on its own. There were 37 baby boys named Tim in the US last year, versus over 1700 named Timothy.

Streamlined version of the classic boys' names, sometimes a short form of Jonathan, which is in fact an entirely different name from John attached to a different Biblical personage. Jon feels more modern than the traditional John, but some may find it an overly slight variation on an already slim name. Jon Snow is a popular character on HBO's Game of Thrones.

Fiery but slight middle name choice; much more apt to be a redhead's nickname.

Though most Mels are playing pinochle with Murray and Morris, there was a notable Saint Mel. He is one of the earliest Irish saints, a nephew of St. Patrick. He became a priest, then built a great monastery where he served as abbot.

Peaked in the 1940s, but still an amiable classic, a la Joe and Tom -- though rarely used on its own.

Ron is a masculine name that functions both as a standalone name and as a shortened form of longer names like Ronald, Aaron, or Byron. Ronald, its most common source, derives from the Old Norse 'Rögnvaldr,' meaning 'ruler's advisor' or 'decision maker.'

A very popular name for girls in Japan, though it is a unisex choice. It can mean "severe, cold", but also "dignified", "ethics" and "phosphorus", depending on the kanji used. It is notably used for the Vocaloid Rin Kagamine.

Bix is a cool and jazzy nickname name, thanks to that final x. It's largely associated with the legendary and influential cornet player (and inspiration for the novel Young Man With a Horn), Bix Beiderbecke. He was born Leon Bismark Beiderbecke and his nickname derived from his middle name.