The least usable of the Three Musketeers names. 

D'artagnan

Dagger is one of the new <a href="https://nameberry.com/list/404/badass-baby-names">badass baby names</a>, a sharp and scary choice that some parents may feel arm their child for battle in a cruel modern world.

Dagger

One of the flower names, used occasionally in Britain (where it's pronounced DAY-lee-a). It seems to have recovered from what was perceived as a slightly affected la-di-dah air. The flower was named in honor of the pioneering Swedish botanist Andreas Dahl, which means dale.
 In the Victorian language of flowers, Dahlia denotes elegance and dignity.
 In P.G. Wodehouse's Jeeves stories, Dahlia is Bertie Wooster's more sympathetic aunt, described as being constructed along the lines of Mae West. Reporter Dahlia Lithwick covers legal matters for the online magazine Slate.

Dahlia

Daisy, fresh, wholesome, and energetic, is one of the flower names that burst back into bloom after a century's hibernation. Originally a nickname for Margaret (the French Marguerite is the word for the flower), Daisy comes from the phrase "day's eye," because it opens its petals at daybreak.

 Daisy has a colorful literary and pop culture history – as the innocent Daisy Miller in the Henry James novella, as Daisy Buchanan, the hero's object of desire in The Great Gatsby, and as many movie and TV characters, including in L'il Abner and The Dukes of Hazzard, as the older Daisy in Driving Miss..., as well as Julia Roberts's character in her breakthrough movie, Mystic Pizza.

 Meg Ryan has a daughter named Daisy True, chef Jamie Oliver has Daisy Boo, and Katy Perry and Orlando Bloom recently named their daughter Daisy Dove.

Daisy

Similar in sound to the flower name Dahlia, this gentle but distinctive name, heard in many cultures, hits that Golden Mean between too popular and too unusual. In Lithuanian mythology, Dalia is a goddess of weaving and of fate.

Dalia

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

Dart

Dash is a nickname that can stand on its own and sounds, well, dashing. Connected these days with Kardashian enterprises.
 Dash can stand on its own—as is evidenced by its entry into the US Top 1000 in 2014—or as a nickname for Dashiell.

Dash

This name was transposed from the word for a church officer to a baby name when Reese Witherspoon and Ryan Phillippe chose it for their son, after a baseball player ancestor, and Don Johnson followed suit. Its popularity also got a boost from Nashville character Deacon Claybourne -- only to fall a bit in recent years.

Deacon

Declan is the Anglicized form of the Irish name Deaglán. St. Declan was one of the first missionaries to bring Christianity to Ireland, preceding St. Patrick. Originally from Wales, he founded the monastery of Ardmore in Ireland.
 
Declan, the amiable and appealing name of an Irish saint (and the real first name of singer Elvis Costello), is very popular in the Emerald Isle and beginning its certain climb to popularity here, after debuting on the American list in 1998. Like Aidan and Liam, Declan is shaping up to be an American hit.
 
Declan Porter is a current character on Revenge. 
 Cyndi Lauper spelled her son's name Declyn.

Declan

Classical and Shakespearean name that may appeal if you like your names long, flowing and multicultural.

Demetrius

Worldly, artistic and attractive Slavic version of the name of the Greek god of fertility and farming.

Dmitri

One of those ultimate cool-girl names, played by Keira Knightley in a movie about a supermodel-turned-bounty hunter, but kids might associate it with the game. High profile British designer India Hicks used it for her daughter. As a <a href="https://nameberry.com/girl-names">girls' name</a>it's still very rare, used in 2015 in the US for only seven baby girls.

Domino

A simple one-syllable name that has been on the popularity list since the mid-1980s, Drake is most associated today with the single-named rapper (born Aubrey). The name peaked at Number 197 in 2010 and has since been on a slow decline, but it still can be counted among the stylish contemporary <a href="https://nameberry.com/search/boys-names/d">boy names starting with D</a>.

Drake

Possible middle name inspiration. Has been used as a first by musical couple Sole and Ginuwine, and basketball star Allen Iverson.

The Master List - D