Ax makes a somewhat threatening short form of the popular Axel, given to more than 3000 baby boys last year. It can also be used on its own, though it usually isn't. There were, however, seven baby boys named Axe in the US in 2015.

When Kate Hudson named her second son Bingham and announced that she would be calling him Bing, it put this zingy nickname name out on the table. Before that, there was only one, further nicknamed Der Bingle -- and he was really Harry Lillis Crosby. 
 And nowadays it's also a Microsoft search engine--but in any case, Bing has a lot of zing.

Bing

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.
 Bix could easily fit in with cousins Jax, Dax, etc.

The surname of enterprising journalist Nellie Bly and poet Robert Bly makes a simple, modern, and upbeat sounding choice for either a boy or a girl.

Comedian Roseanne Barr chose this macho nature name for her son. In the 18th century it was used to describe a dashing, fashionable dressed man. Buck fits in well alongside names like Beck, Jack and Huck. 

 The traditional name of the full moon in July, Buck Moon, relates to the fact that the antlers of male deer reach their peak growth around this time of year.

Buck

Chess

This British river name sounds sleek and strong but perhaps a bit too energetic. 

Dart

Many African tribes have a tradition of naming children for the day or time they were born -- Friday, Afternoon -- a practice finding new life in the Western world as word names become more popular. 

Diehard World War II buffs may be interested in this name as a reference to American combat medic Desmond Doss, the first conscientious objector to be awarded the metal of honor. But it carries a host of negative connotations in the U.K., especially in Scotland, related to laziness and the shirking of work.

Doss

Floy

Hart could be the hero of a romantic novel, but on the other hand, it's short, straightforward, and strong sounding. The most famous bearer of the name was tragic poet Hart (born Harold) Crane, but it also has musical cred via Lorenz Hart, of the classic Rodgers & Hart songwriting duo and a literary tie to playwright Moss Hart.
 Hart would make an interesting middle name choice--with heart.

Hart

Hodge is a medieval English nickname for Roger, which was brought to England after the Norman Conquest of 1066. Roger isn't ready for a comeback yet, but we'd love to see the resurgence of Hodge, which never was a common choice in the US.
 
Hodge is the middle name of one of Sarah Jessica Parker and Matthew Broderick's twin daughters, Tabitha.

Hodge

Isle

Jinx, a James Bond heroine name has an ominous meaning but kinetic energy. In the film "Die Another Day," the actual first name of the character played by Halle Berry is Giacinta.

Jinx

Keys

In one recent year there were 60 baby girls in the US named Lark....and only eight baby boys. But there's no reason this bird name can't also be masculine, especially given that Robin is making a comeback for boys and Sparrow is a notable starbaby boy (he's Nicole Richie and Joel Madden's son).

If you need further convincing Girl Names for Boys was one of our hottest <a href="https://nameberry.com/blog/baby-name-trends-2024">baby name trends</a> of the year.

Lark

Oak, a symbol of solidity, strength, and longevity, is joining Cedar and Pine as a viable name, one that would work especially well in the middle.
 If you'd prefer to take the longer route to the name, you can consider the surnames Oakes or Oakley.

A grassy place with trees is a nice image to attach to a name. 

Park

Pell makes an unusual middle name choice.  And if grandpa Seymour was a fur trader, you might do better to honor him by naming the baby Pell.

Pell

An evocative unisex one-syllable name, Poe is most distinguished by its literary reference. Edgar Allan Poe was an influential American author and poet, credited with inventing the genres of detective and science fiction, which might provide inspiration for parents who are fans. And now its choice as the name of the hero played by Oscar Isaac in the new Star Wars movie is sure to catapult it from literary choice to major favorite.
 The female singer-songwriter professionally known as Poe was born with the more prosaic name Ann.
 The variant spelling Po is identified with Po Bronson, the chronicler of the technological age, and also has the geographical association with the river in northern Italy.

Pem 

Mostly feminine, though "Office" star Rainn Wilson gives it a slight masculine twist.  You might also use this as a short form of Raines.

Rain

Rigs

Rell 

Ryde

Snow is increasing in usage mostly as a girls' name, but hero Jon Snow of Game of Thrones just might nudge it into the boys' column.  Currently, there are 12 times as many girls named Snow as boys, but its usage is much higher in middle place.

Snow

Thor, the powerful name of the Norse god of thunder, strength and rain, would make a bold statement. Long a comic book staple, Thor has now invaded the big screen, and could land on birth certificates as well.
 Thor Heyerdahl was a famous Norwegian anthropologist/adventurer, author of the book Kon Tiki.
In Norse mythology, Thor was the son of Odin--another crossover name possibility--who was sometimes referred to as Bjorn in Old Norse poetry. Tor is a popular variation (which is also the Hebrew name of a bird that symbolizes the arrival of spring).

Thor

Actor Rhames's imaginative shortening of the prosaic Irving, giving it new life and energy. 

Ving

Voss is a German name, that is seen in Norway and Australia (in the former it is associated with a region, in the latter it is associated with the protagonist of Patrick White's novel by the same name). Voss is an interesting alternative to Fox.

Voss

Vem 

Wish 

Parents with a penchant for inventing names seem especially enamored of the letter Z, maybe for its counterculture feel and its extra zip. 

Zabe

Appealing sound and meaning, but there is that discount-store association. 

Zale

Short and to-the-point, it turns an ancient biblical name into a friendly cowboy. 

Lennie's list "Cool, Unusual, One Syllable Nicknames" of 41 great name ideas: Ax - Zy!