DAGMAR (f.) - apparently Old Norse 'day + maid'; aure "day"; -wen "maiden", thus Aurewen; or alternatively a reworking of Slavic 'Dragomira'
DAISY (f.) - Arien, Arehen or Aurehen, see NWHAGEN
DAKOTA (m.) - Dakota 'friend'; nildo "friend", so Nildo as such
DAMIAN, DAMIEN (m.) - Greek 'to tame, master'; tur- "wield, control, govern", so perhaps Turion ("one who governs")
DANIEL (m.) - Heb. 'Gof is my judge'; Eru "God"; námo "judge", thus Erunámo
DANIELA (f.) - feminine of DANIEL (q.v.), thus Erunáme
DARA (m.) - Irish 'oak tree'; norno "oak", so Norno itself
DARA (f.) - Heb. 'pearl of wisdom'; nóre "wisdom, lore", marilla "pearl" (this word is from the Qenya Lexicon, so need not be valid in LotR-style Quenya, maybe this could be used instead:) míre "jewel", so Nólemarille or Nólemíre
DARCY (f.) - said to mean 'from darkness' (probably a folk etymology); mornie "darkness" which might be used as such
DARIA (f.) - feminine form of DARIUS (q.v.), so Máreharne or Máraharne
DARINA (f.) - Slavic 'gifted, given'; antaina "given", so Antaine
DARIUS (m.) - Persian 'possess good'; máne, mára "good", harno "possesser", so Máneharno or Máraharno
DARREN (m.) - said to mean 'little great one'; alta "great", -lle a diminutive suffix, so perhaps Altallo
DASHA (f.) - said to mean 'gift of god'; eru "god", anna "gift", so Eruanna
DAVID (m.) - Meldon, see NWHAGEN; some David adopted and adapted his name to Eldarin languages, so Lavir in Quenya and Dewidh in Sindarin
DAVINA (f.) - feminine of DAVID (q.v.), thus Melde, see also NWHAGEN
DAWN (f.) - 'dawn, daybreak'; ára "dawn", thus Ára itself
DEAN (m.) - Old Eng. 'valley'; nan "valley", so Nando
DEANA (f.) - either a feminine form of DEAN (q.v.), so Nande or a form of DIANA (q.v.) or a form of DINA (q.v.)
DEBORAH (f.) - Heb. 'a bee'; nier, nion "honey-bee", thus Niere or Nione
DECIMA (f.) - feminine of DECIMUS (q.v.), thus Cainenye
DECIMUS (m.) - Latin 'tenth'; *cainenya "tenth", thus Cainenyo
DEIRDRE (f.) - either Gaelic 'sorrow'; saira "sad, lamentable", so Saire; or a version of DERDIU (q.v.), so Nornonis or Nornis
DELIA (f.) - Greek 'of Delos'; the name of the island may be adopted to Quenya, so it might be Leliel (with -iel "daughter of"); it was also suggested that it might mean 'jewel of the sea' (from Latin); aire "sea", míre "jewel", so Airemir
DELICIA (f.) - Latin 'delight'; alasse "joy", thus maybe Alasse itself
DELWYN (f.) - Welsh 'pretty + white'; vanya "fair, beautuful"; losse "white", thus Vanyalos (Vanyalosse)
DEMETER (f.) - Greek 'earth mother'; cemen "earth", amme "mother", so Cemenamme or Cementári (which a title of Yavanna, meaning "queen of earth")
DENIS (m.) - said to be derived from Dionysos whose meaning is obscure, but the first part seems to be related to the name of the supreme Zeus; Eru "God", thus could be Eruner ("God-man") or many others; Dionysos's most popular attributes were fernity and wine, maybe he could be called "God of fernity/wine" and this translated to Quenya; aute "prosperity, wealth, *richness, *fernity"; limpe "wine"; "god" should probably be translated here as ainu rather then Eru, so other possibilities for this name are Autainu or Limpainu
DENISE (f.) - feminine form of DENIS (q.v.), thus could be Erunis ("God-woman") or many others; also Autaini or Limpaini wherein Aini is the feminine equivalent of Ainu (see DENIS)
DENIZ (m. & f.) - Turkish 'sea'; ear, aire, thus masc. Earo or Airo, and fem. Eare or Aire itself
DEREK (m.) - from THEODORIC (q.v.)
DERDIU (f.) - said to mean 'oak woman'; norno "oak-tree", nis "woman", so Nornonis or contracted Nornis
DESIRÉE (f.) - from Latin 'desired'; *merna "desided, wanted", thus Merne
DESTINY (f.) - 'destiny'; maranwe "destiny", thus Maranwe itself
DEVON (m.) - from Gealic 'poet'; linwe "poem, lay", *carindo "maker, doer" (cf. colindo "bearer" or melindo "lover"), so Linwecarindo (there is no single word published for "poet"); it might also be possible to use only Linwe, as -we is a personal suffix, so we can get this coincidence
DEVONA (m.) - feminine form of DEVON (q.v.), so probably Linwecarisse (because melisse is a feminine counterpart of melindo). Perhaps Linwe would be possible, too.
DEXTER (m.) - could be Latin 'righthanded'; formaite "righthanded, dexterous", thus Formaito or Formaiton
DIANA (f.) - probably derivative of Greek 'God'; Eru, valie "God", thus could be Erume or Eruwen ("God-girl") or just Valie
DILWEN (f.) - Welsh 'true/genuine + white'; arwa "real, actual, true"; losse "white", thus Arwalos (Arwalosse)
DILYS (f.) - Welsh 'true/genuine'; arwa "real, actual, true", thus Arwe
DIMITRA (f.) - see DEMETER
DINA (f.) - Heb. 'judgment' or 'judged'; Námo "he-judge", thus Náme ("she-judge) or *namna "judged", so Namne
DIXIE (f.) - maybe from French 'ten'; cainen "ten", thus maybe Cainen itself
DOLORES (f.) - Spanish 'sorrow'; nyére "sorrow, grief", thus Nyére itself
DOMINIC (m.) - from Latin 'of lord'; héro, heruo "of lord", thus Héro or Heruo themselves
DOMINIQUE, DOMINICA (f.) - feminine of DOMINIC (q.v.), Herio
DONALD (m.) - Ambartur, see NWHAGEN
DONNA (f.) - Italian 'lady'; heri "lady", thus Heri itself; or feminine form of DONALD (q.v.), thus Ambarture
DONOVAN - Gaelic 'dark brown one'; lóra "dark", varne "brown", so Lóravarnion
DORIAN - maybe Greek 'gift-man'; anna "gift"; -ner "-man", thus Annaner or contracted Anner
DORIS (f.) - maybe Greek 'gift-woman'; anna "gift"; -nis "-woman", thus Annanis or contracted Annis
DOROTHEA (f.) - Greek 'gift + god'; anna "gift"; Eru "God", thus maybe Anneri
DOUGLAS (m.) - Gaelic 'black + stream/blue'; mor- "black"; celu"steam", thus Morcelu
DREW (m. & f.) - short form of ANDREW (q.v.), but it is also used for girls (cf. Drew Barrimore), thus maybe Vé or Veasse
DILCIE (f.) - derivative of Latin 'sweet'; lisse "sweet", thus could be Lissie
DUDLEY (m.) - Old Eng. 'Dudda's clearing'; we could adapt 'Dudda' to Queya as Lulla, so perhaps Lullasalquo (for salquo see WESLEY)
DUNCAN (m.) - probably Gaelic 'brown chief'; varni- "brown-"; -her "-lord", thus Varniher
DUNSTAN (m.) - Old Eng. 'dark stone'; mor- "dark-"; ondo "stone", thus Morondo
DUSTIN (m.) - Old Norse 'Thor's stone'; Thor may be rendered as Eru; ondo "stone", thus Eruondo; or if you think Eru is not the best equivalent of 'Thor', we may adapt the name to Quenya, and Sorondo may then be a possibility
DYLAN (m.) - Welsh 'sea'; ear "sea", so Ear itself or Earo with a masculine ending
DYLAN (f.) - [I saw this name used for a girl, so:] aire "sea"
(a variant of the above-mentioned ear), so Aire
<get out get outta here enough already>