Casimir, a traditional name of Polish kings, could do quite well these days as we see the rise of Caspian, Cassius, Castiel, et. al. Like Leopold and Laszlo, Casimir is strong and worth considering if you've got an adventurous streak — and bet your son will too.

Bram has an unusual measure of character and charm for a one-syllable name; it started as a hipper-than-Abe diminutive of the biblical Abraham, but is also an independent Irish and Dutch name, made famous by Irish-born Dracula creator Bram (nee Abraham) Stoker. Bram is currently Number 16 in the Netherlands; Bram Howard was a character on The West Wing.

Lochlan and Lachlan are running neck and neck and both rising into the Top 1000. Which spelling you use is purely a matter of taste.

Lorcan is a name rich in Irish history as belonging to several kings, including the grandfather of the most famous high king of Ireland, Brian Boru. Lorcan O'Toole, known in English as Laurence O'Toole, is the patron saint of Dublin, so it's not too surprising that Irish-born actor Peter O'Toole named his son Lorcan.

Clive started life as a surname for someone who lived near a cliff, making it a secret outdoorsy name.

A contraction name, Sidney comes from Saint Denis and is related to Dioynsius, the Greek god of fertility and wine, although another theory is that it derived from an Anglo-Saxon place name, meaning 'at the wide island.'

Lars is a perfect candidate for a cross-cultural passport: it has been heard often enough here to sound familiar and friendly, yet retains the charisma of a charming foreigner.

Humphrey is an old name that might have faded completely were it not for that Bogie flair. A royal name in Britain, where it's used somewhat more frequently, Humphrey might just have some life beyond Bogart here, especially with the recent interest in the names of Golden Age Hollywood stars. His first name was the maiden name of his mother, Maud Humphrey, a well-known illustrator who used baby H. as a model.

The great American novelist sets this above many other surnames (and nature names, for that matter), but it's still an imposing and adventurous choice. Do nicknames Hawk or Thorne make it more approachable? How about Hank or Hal instead?

Could be a novel way for a boy's name to honor an ancestral Claire.

Keaton is an engaging surname with warmth, energy and a sense of humor, identified with silent comedian Buster Keaton and contemporary actors Michael and Diane Keaton. Given to around 290 boys in a recent year, it currently sits within the latter end of the US Top 1000.

An upscale surname with a nice modern design connection to the creators of the Eames chair and other midcentury furniture classics, Charles and Ray Eames.

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.

Theron is best known these days as the surname of actress Charlize, but it does have a long history as a first name, ranking in the Top 500 in the early part of the 20th century and only dropping out of the Top 1000 in the early 1990s. Theon is a similar name made familiar by the popular series Game of Thrones: Might it and Theron rise in tandem?

Levin, known in the U.S. mostly as a surname, is a Top 100 boys' name in Germany. There have been saints with variations of this name, whose meaning relates to love.

Winston meets Marlow in this surname-style choice, blending old-fashioned charm and a hint of stuffiness with a bit of modern edge and breeziness too. Borne by the distinguished American landscape painter Winslow Homer, it could make a creative and unexpected choice, though some may be put off by the 'slow' ending.

The iconic Gone With the Wind star Clark's surname was brought into the first-name mix when Weeds' Kevin Nealon picked it for his son. Gable makes a strong and unusual possibility, a rhyming cousin to Abel and Mabel.

Heron may feel like a very usable nature name -- the heron is a long-legged wading bird -- but it was also the name of a 1st century Greek inventor and of an Egyptian saint. Highly unusual yet easy to understand and meaningful on several levels, Heron is a fantastic choice.

Out playing shuffleboard at his condo and not expected back for several generations -- unless it morphs into a girls' name, a la Sydney.

Like Harbor, one of the new generation of word names with appealing meanings, though (female) memoirist Haven Kimmel has tipped it decidedly toward the girls' side.