Begins or Ends with O

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.

Richard is far from fashionable, but Ricardo is one of the most popular Spanish names for boys in the US. And it does sound far more appealing that the English version.

Madonna did much to polish up the image of this old-neighborhood Italian choice when she picked it for her son with British director Guy Ritchie, and several years later it was also used by Rose Byrne and Bobby Canavale for their son. It now feels much more mainstream than many celebrity baby names, sharing the quirky appeal of some other so-far-out-they're-in baby names as Bruno and Hugo.

It wasn't so long ago that Romeo was considered as outre for an American baby as Casanova or Cupid. But that really changed when David and Victoria Beckham chose it for their second son in 2002, a path followed by Jon Bon Jovi.

Rousseau gives French flair to other red-haired names like Russell and Rory. It is associated with the influential eighteenth century philosopher Jean-Jacques Rousseau, as well as the painter Henri Rousseau.

Widely heard in both Italian and Spanish households, Sergio and his many international brothers are rooted in Sergius, one of the original Roman family names. The meaning is unknown, but possibly is related to servant or protector.

Silvanus was the Roman god of the forests and is also an alternate name in the New Testament for Silas. Relatives include Silvio, Silvius, and Sylvia.

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 dashing French surname name most famously borne by Henry David Thoreau, an American naturalist, writer and philosopher who influenced such notable figures as Leo Tolstoy, Mahatma Gandhi, and Martin Luther King Jr. The most common modern American pronunciation is "thor-OH", with emphasis on the final syllable, although Thoreau himself pronounced it "THOR-oh".

The name of minor characters in Shakespeare's two of Roman plays – Julius Caesar and Timon of Athens – and a noble Spanish surname. Though probably etymologically unrelated to the Latin word for truth, "veritas," it still carries the feeling of forthrightness and honesty.

Though to most Americans Viggo is a one-person name attached to intense actor Mortensen, it is actually an old Norse name dating back to the Vikings, and is currently the 32nd most popular appellation in Sweden. Viggo Mortensen is a Jr., sharing his name with his Danish father.