With its cool -X ending, Jax is an update on the classic nickname Jack, likely inspired by the rise of Jackson. It garnered attention in the US thanks to the game, Mortal Kombat II back in the '90s, and was pushed up the charts when it was used in the show Sons of Anarchy, in which Jackson "Jax" Teller is the central character.

Ajax is the name of two Greek heroes, both who fought in the Trojan war and feature in Homer's "Iliad". Distinctive yet familiar in sound, thanks to similar choices like Jack, Asa, and Ajay, Ajax is also the name of a foaming cleanser in the US, and if you find that reference too strong, you might try the shortened Jax instead.

Yes, it's pronounced with a long o sound at the end, just like Margo and Margot. This spelling was popularized by supermodel, actress, and tragic Hemingway granddaughter Margaux, whose name spelling came courtesy of a bottle of French wine. (The original spelling of her name was Margot; she changed it when she heard her parents were drinking a bottle of Chateau Margaux the night she was conceived.) Margo itself is a diminutive of Margaret, which means "pearl" or, in its French version, "daisy." Margaret or Marguerite would be more stylish variations now.

One of the fierce new animal names new to name lists, helped by its strong x-ending.

Swashbuckling name worthy of a hero in a romance novel. Deveraux or Devereaux is drawn from the town of Evreux in France and combined with the prefix de- denoting it likely referred to a noble of that area.

Despite its rakish western charm, still remains a cowboy costume without a real persona inside.

A chic and sassy French choice, popular in France but likely to be confused with the more prosaic Alex in English-speaking countries. Although sometimes used in the US as a variant spelling of Alex, the French name Alix actually derives from a medieval French form of the name Alice or Adelaide.

An unusual name related to the willow family.

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.

Roux, a color name meaning russet or reddish brown, is a possible middle name for your little auburn-haired babe, though a post-Hunger Games child would more likely be called Rue. Roux is also a culinary term for a mixture of fat and flour used in French cooking to make sauces.

Pronounced "crwa", this unusual name was chosen by Cedric the Entertainer for his son.

Rockers Ashlee Simpson and Pete Wentz put a new baby name on the map when they chose this downscale New York borough name for their son. The Bronx, the place, was named for early Dutch settler Jonas Bronck. Might Bronx become the next Brooklyn? We'd be surprised if it did.

Dex, the nickname for Dexter that is sometimes used on its own, has lots of energy and dynamism. It was chosen by comedian Dana Carvey for his now grown son. With the growing popularity of Dexter, we may be seeing more of Dex.

Castor's twin in the constellation Gemini. That final x makes this name modern and cool.

Rhythmic and sensual -- maybe too sensual, in terms of playground teasing. Sax Rohmer was the nom de plume of the prolific English novelist who created Dr.Fu Manchu.

An X-ending surname less common than the Jolie-Pitt-inspired Maddox. Grandparents might still associate it with the old TV crime show. 

Lex is still used mostly for boys, but like Alex, may cross over with the rising popularity of all long forms of the name. Lexi is another, more feminine option.

If you want to honor your grandfather Hal but can't work up much enthusiasm for his full name Harold, consider the more stylish (if a bit pretentious) capital of Nova Scotia.

Once a birth order name, now might work as a cool x-ending nickname. But be warned that it sounds very close to an unfortunate slang term.

Phar-phetched.