D-Dun-Dun-Dun-Duuuuunn

Did you know there're no D-names for girls in the Top 100? Destiny is the highest-ranked, at #113, followed by Delilah, Daniela, Daisy, & Delaney also in the Top 250.
In the past, a few different D-names have been common for girls (several currently are for boys!), but I guess most must be 'unstylish' right now.

• Daciana (dah-chee-AH-nah, Romanian)
• Dagny (DAHG-nee, Norwegian; DAHNG-nee, Swedish; DAG-nee, English)--from Old Norse, "new day". Latvian form is Dagnija (DAHG-nee-yah).
• Dahlia (DAH-lee-ah or DAY-lee-ah, English)--Spanish form is Dalia (DAHL-yah)
• Daina (DAY-nah, Lithuanian; DYE-nah, Latvian)--"song"
• Dáiríne (DAH-rin-yeh, Irish)--Anglicized as Darina. 
• Damaris (DAM-ah-ris, English; DAH-mah-ris, German; dah-MAH-rees, Spanish)
• Damhnait (DAV-nat, DOW-nat, Irish)--"fawn". Anglicized as Devnet or Dymphna (DIMF-nah)
• Damiana (dah-mee-AH-nah, Italian)--feminine of Damian. 
• Danaë (dah-NAH-ee, Greek)
• Danica (DAN-ik-ah, English; DAH-nee-kah, Slavic)--"morning star"
• Daniyah (DAN-ee-ah, Arabic)
• Daphne (DAF-nee, English; DAHF-neh, Dutch & German)--from Greek, "laurel". Other forms include Dafna (Hebrew), Dafne (Italian), & Dafina (Albanian & Macedonian)
• Dara (DAH-rah, Slavic)--"gift". Other forms include Darinka, Darina & Daryna.  [masculine in other languages/origins]
• Darcy (DAR-see, English)
• Daria (DAH-ree-ah, Italian, Polish)--feminine of Darius. Other forms include Dareia (Greek), Darija (Croatian, Serbian), Darja (Czech), and Darya (Russian)
• Darya (dahr-YAH, Persian)--"sea"
• Davina (dah-VEE-nah, English)--feminine of David
• Deirdre (DEER-dreh, English; DEHR-dreh, Irish)
• Delphine (del-FEEN, French)--other forms include Delphina (Latin), Delfina (Italian, Spanish), & Delphia (English)
• Delwen (DEL-wen, Welsh)--"pretty & blessed"
• Delyth (DEL-ith, Welsh)--"pretty"
• Demeter (deh-MEE-ter, English; deh-MEH-tehr, Greek)--"earth mother"
• Demetria (deh-MEE-tree-ah, English; deh-MEH-tree-ah, Greek, Italian)
• Denica (deh-NEETZ-ah, Macedonian, Bulgarian)--"day, morning"
• Despina (DES-pee-nah, Greek, Russian, Macedonian)
• Desta (DEH-stah, Amharic)--"joy"
• Devi (DEV-ee, Hindi)--"goddess"
• Devika (DEV-ee-kah, Hindi)--"little goddess"
• Diantha (dee-AHN-thah, Dutch, English)--from Greek, "heavenly flower"
• Dilan (dee-LAHN, Turkish)--"love"
• Dinah (DYE-nah, English; dee-NAH, Hebrew)
• Dionisia (dee-oh-NEE-see-ah, English, Portuguese, Spanish, Italian)--form of Denise. 
• Doina (DOH-ee-nah, Romanian)--"folk song"
• Domenica (doh-MEH-nee-kah, Italian)--feminine of Dominic. Other forms include Dominga (Spanish), Dominica (Latin), Dominika (Czech, Russian, Polish, Slovak), and Domnika (Macedonian)
• Donata (doh-NAH-tah, Italian)
• Dorothea (doh-roh-THEE-ah, English; doh-roh-TE-ah, German)--other forms include Dorete (doh-REH-teh, Danish, Swedish), Dorotea (doh-roh-TEH-ah, Italian, Spanish, Croatian) & Dorit (DOHR-it, Scandinavian). 
• Drusa (DROO-sah, Latin)--another (Latin) form is Druscilla.
• Dua (DOO-ah, Arabic)--"prayer"
• Dulcinea (dool-sin-EH-ah, Spanish, English)
• Dunja (DOON-yah, Slavic)
• Dušana (doo-SHAH-nah, Slavic)--"soul"

Too Many Variants! (2012)

Only a little bit late (and yay! I figured out a quicker way to compile the data!).
As always, many of the spellings are rather....ambiguous, and could easily lend themselves to multiple pronunciations.

In previous years, I've listed names with more than 20 spellings recorded, but either my former "browse and count" method was inefficient, or there's a lot more "creativity" this year (I'm guessing the former), so I'll only be listing names with 25 or more recorded spellings. 

I know, you're sad now. ;)

Boys:

• 65 spellings--Kayden
• 52 spellings--Giovanni
• 49 spellings--Aiden
• 41 spellings--Jayden
• 34 spellings--Kason
• 31 spellings--Isaac
• 31 spellings--Josiah
• 30 spellings--Mekhi
• 29 spellings--Aaron
• 29 spellings--Kian
• 29 spellings--Javon
• 28 spellings--Zayden
• 27 spellings--Cameron
• 27 spellings--Zachary
• 26 spellings--Isaiah
• 26 spellings--Calen
• 26 spellings--Keshawn
• 25 spellings--Jackson
• 25 spellings--Kamari

Girls:

• 80 spellings--Arianna
• 78 spellings--Kaylee
• 75 spellings--Aaliyah
• 66 spellings--Kaliyah
• 60 spellings--Mackenzie
• 58 spellings--Jocelyn
• 56 spellings--Makayla
• 55 spellings--Kaelyn
• 54 spellings--Madelyn
• 53 spellings--Kamiyah
• 45 spellings--Malia
• 42 spellings--Amaya
• 42 spellings--Giselle
• 40 spellings--Aniyah
• 39 spellings--Alicia
• 39 spellings--Janiyah
• 37 spellings--Abigail
• 37 spellings--Hailey
• 37 spellings--Brianna
• 37 spellings--Jaliyah
• 36 spellings--Makiyah
• 35 spellings--Liliana
• 34 spellings--Adalyn
• 34 spellings--Saniyah
• 34 spellings--Kiana
• 34 spellings--Alaysia
• 33 spellings--Elena
• 33 spellings--Jaelyn
• 32 spellings--Emily
• 32 spellings--Annalise
• 32 spellings--Aliana
• 31 spellings--Kaitlyn
• 31 spellings--Kylie
• 31 spellings--Alyssa
• 31 spellings--Samiyah
• 30 spellings--Riley
• 30 spellings--Nevaeh
• 30 spellings--Kennedy
• 30 spellings--Raelynn
• 30 spellings--Tiana
• 30 spellings--Maylee
• 29 spellings--Aria
• 29 spellings--Eliana
• 29 spellings--Jacqueline
• 29 spellings--Zariah
• 29 spellings--Alani
• 28 spellings--Aiyana
• 28 spellings--Liana
• 28 spellings--Casey
• 28 spellings--Cataleya
• 27 spellings--Kaydence
• 27 spellings--Kiara
• 26 spellings--Alana
• 26 spellings--Elise
• 26 spellings--Jamiyah
• 26 spellings--Adalee
• 26 spellings--Dania
• 25 spellings--Olivia
• 25 spellings--Madison
• 25 spellings--Addison
• 25 spellings--Natalie
• 25 spellings--Amelia
• 25 spellings--Lillian
• 25 spellings--Reagan
• 25 spellings--Jazlyn
• 25 spellings--Mckinley

Analysis based on NameNerds' popularity lists.
If you want my full (painful) re-rankings, you can find them here (boys) and here (girls).