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.

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.

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.

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.

During the heyday of Deborah, Debra, and Debra — the late 1950s and early 60s — there were enough baby girls named Deb, just Deb, for it to make the Top 1000.

Cross-cultural winner.

Cameron is still more popular as a boy's name than a girls and this simple, snappy short form works well for either sex.

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.

The Biblical Simon has been rediscovered and this appealing short form, an alternative to Sam, might be a way to make your Simon even more special.

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.

Flo is an antiquated nickname not often used these days, possibly because "Aunt Flo" is a euphemism for a period.

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

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.

Bobbsey Twins-era nickname name that could find new life via Nan, heroine of The Nanny Diaries. Nan was also the nickname of Annabel St George, the protagonist of Edith Wharton's novel "The Buccaneers".

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.

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

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.'

Occasionally used as an independent name, but why.

Bev is primarily a feminine name that originated as a short form of Beverly, which was initially an English surname derived from a place name meaning 'beaver stream.' This concise, single-syllable name carries a friendly, approachable quality that became particularly popular in the mid-20th century. Bev gained independent usage during the 1950s and 1960s when nickname forms were often given as formal names. While its popularity has declined since its peak, Bev retains a vintage charm and unpretentious warmth. It exemplifies the mid-century trend of short, efficient names and continues to be appreciated for its simplicity and nostalgic appeal.