Castle!

Spunky Irish surname that still has a pugnacious feel from its lingering association with one of boxing's greatest champs, Jack Dempsey. Many people may associate it more with Patrick Dempsey these days—McDreamy from TV's Grey's Anatomy.

Although it has come to sound Irish, Dennis is one of the most widely-used French names (St. Denis is the patron saint of France) and harks back even further to Dionysius, the Greek god of wine and debauchery. It was introduced to England by the Normans.

Though a variation of Dion, this name made it into 2013's Top 1000 while the original did not.

This Irish surname packs a lot of attitude, projecting an image of spunk and sass. The Welsh singer Duffy, born Aimee Anne Duffy, is best known for her songs Mercy and Warwick Avenue.

Dylan still feels poetic and romantic after years of popularity. It still ranks highly on the charts, among the top boy names starting with D, so if you choose it, be aware that yours may not be the only Dylan in his class.

dy and llanw, meaning "sea." In Welsh mythology, Dylan was a legendary sea god who prompted all the waters of Britain and Ireland to weep when he died. The name came to prominence via the great Welsh poet Dylan Thomas, whose name Bob Dylan adopted in tribute.

Edgar is an Old English name historically associated with the tenth century English king known as Edgar the Peaceful. There was also a King Edgar of Scotland.

Ellie first took off in the UK—yes, in this nickname form—and this warm and friendly name has also become hugely popular here. In 2011, Ellie entered the US Top 100 girl names for the first time and has remained near the top of the charts ever since.

Ellis is a former Old Man Name turned gender-neutral choice for the 21st century. It's one of the less used names in the currently popular El-family.

Dashing and suave, with a hint of poetry and gentleness, Emilio is an appealing and international choice. A solid favorite in Italy, it is also on the rise in the US, France, Austria, and the UK.

Ethan is a name that succeeds in being at once classic and fashionable, serious and cheery, strong and sensitive. Given a big boost via the name of the Tom Cruise character in the Mission Impossible film series, Ethan has fallen from its peak at Number 2 in 2009 and 2010, but is still popular in the US along with several other countries.

Gage was part of the craze for one-syllable surnames, with associations to tasty green gage plums and the mathematical gauge.

When Gary cracked the Top 10 in 1950, it was one of the first nonclassic boys’ names to do so, largely due to Gary (born Frank) Cooper, who was renamed after Gary, Indiana, his agent's hometown. Now, a 65 years later, Gary isn't particularly high in the charts, and has lost any glitter it had. May we suggest the fuller name Gareth?

In the US, this spelling is less common than mid-century favorite Jeffrey, and it has faded from popularity faster. This more British spelling is the usual form for historical figures like Geoffrey Chaucer and the Welsh historian Geoffrey of Monmouth, and as such it may feel more rooted and enduring.

Has been used on its own since the 1920s, but still seems like only part of a name. Was very much tied to mid-century Italian sexpot Gina Lollobrigida.

One-time beach-boy compadre of Glenn, Greg, and Gary that originated as a nickname for a tall person, Grant has become a no-nonsense, career-oriented grown-up and one that is seeing new appreciation. It was chosen for his son by actor Morris Chestnut. It has cultural cred via artist Grant Wood, whose best known painting is 'American Gothic.'

The Greek name of sixteen popes and fifteen saints, the gregarious Gregory became big in the United States with the emergence of admirable actor Gregory Peck (born Eldred) in the late 1940s. From 1950 to 1973, it was in the Top 30, with nickname Greg becoming a Cool Dude name.

Could Hal be the Jack, Max, or Gus of the future? It just might happen in the new nickname environment. Hank Azaria put it on his son's birth certificate.

You might think of Harper as the hottest name of the last decade, jumping from obscurity to the Top 10, where it remained until last year.

It all started in 1946, when Hayley Mills was given her mother's maiden name. Now that spelling is in third place, after Hailey and Haley, with all three adding up to one of the most popular names in the country. Hayley is the most used spelling in Australia.

The chic Euro spelling of Henry is rising along with the original form.