Alternatives to Jack

Sixties-style short form that sounds cool again -- though the unscrupulous Pete on "Mad Men" is not a character to emulate.

Quinn is an engaging Celtic surname that is still on the rise for girls but beginning to flag for boys. As a female name, Quinn is in the Top 100, used for over 3000 baby girls last year, but toward the bottom of the Top 500 for boys, given to 700 baby boys.

There's Rhys and there's Reese (now more popular for girls) and there's Reece, and we particularly like the traditional Welsh spelling, which entered the list in 2004, possibly influenced by Jonathan Rhys Meyers, of The Tudors, and Welsh-born actor Rhys Ifans.

Last cool when Bogie roamed Casablanca.

Rook is a choose-your-own-adventure type of name. It has so many meanings and associations, that you have the freedom of choice to decide what resonates with you.

Sam has long been used on its own for boys, as accepted standing by itself as it is as a short form of Samuel. Straightforward and down-to-earth, Sam is the name of the son of the co-stars of The Americans, Keri Russell and Matthew Rhys. Sam is one of the most popular names that start with S in the Western world, ranking higher in several European countries than it does in the US, where it's trended downward since the 19th century, though it's always been in the Top 1000.

Short for Samuel or long for Sam, Sammy is a sweet midcentury nickname name that we can see coming back.

Samuel has been so popular for so long that it's hard to believe it's still climbing, at its highest point since the 1890s.

Sean, after a long reign as one of the top Irish boys' names in the US, has now slipped as parents look to fresher Irish choices such as Liam and Aidan. In Ireland, Sean is still highly popular, but variation Senan, an Anglicized spelling of diminutive Seanan, is also stylish in Ireland. While Sean is the Irish form of John, Seanan and Senan may be thought of either as Sean diminutives or relatives of the Latin word "senator".

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.

With Theodore rising, Ted may have new life among parents who don't want to use the short form Theo. And TV's Ted Lasso makes it a quintessential nice guy name.

See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.

A solid classic with plenty of history, Thomas strikes the balance between strength and gentleness. A favorite in the UK, a staple in France, and Australia, and never absent from the US Top 100, Thomas feels like a safe bet and a name that fits into any era.

William is one of the most enduring of classic names for boys. It's also among the most popular boys' names, as American parents see it as being ideally conservative yet contemporary, and hands-down the most popular baby name beginning with W of all time.

Brisk, preppy York is an underused classic with the potential to really shine in the 21st century. It's most familiar as a place name — York is a city in England — and surname. New York City and State were named after the Duke of York.

See Zac.

As the common short form of Zachary or, more unusually, Zachariah, Zack is less intuitive than Zach or Zac in terms of spelling but clearer in terms of pronunciations. Maybe because it rhymes with Jack and Mack, it also feels more complete as a name. Some people also use Zack and brothers as a short form of Isaac.