MARIANNE (f.) - may be a combination of MARIA (q.v.) and ANNE (see ANNA), so Almaresáre or Almiesáre; another possibility is that it is a variant of MARION (q.v.), so Sárelle or Sárince
MARINA (f.) - from Latin 'of the sea'; *earin, *earina "of the sea", thus Earina itself (similar sound) or Earine
MARION (f.) - diminutive form MARY; -ince, -lle diminutive endings, so Sárince or Sárelle
OPHELIA (f.) - possibly derivative of Greek 'help'; resta- "aid" (from Qenya Lexicom, it may happen it is not valid), thus could be Restawen, Restiel, etc.
PERDITA (f.) - from Latin 'lost'; vanwa "lost", thus Vanwe
PENELOPE (f.) - Greek 'weaver'; lanya- "weave", so Lanyare (with the feninine ending -re); there is a name of a Valie 'Vaire' meaning "ever-weaving", so it might work as well or Wire ("weaver" -- without the medial -a- which denotes continuality ("ever") in 'Vaire')
PENNY (f.) - short form of PENELOPE (q.v.), so Lanyare, Vaire or Vire
PETA, PETRA (f.) - a feminine of PETR (q.v.), thus Sarde
PETR (m.) - from Greek 'stone'; sar "[little] stone", thus Sardo
PHILIP (m.) - Roccondil, see NWHAGEN; however Melarocco is already used. -- In Sindarin: Melroch (an equivalent of Melarocco)
PHILIPPA (f.) - feminine form of PHILIP (q.v.), thus Roccondilde or Roccondilme
RAY (m. and f.) - 'ray'; alca "ray of light", thus masc. Alco or Alcon, and fem. Alce
RAYMOND (m.) - Old Ger. 'judgment, council + protector'; námo "judgment", namna "statute"; *varyar "protector", thus Námovaryar or Namnavaryar
RAYNER (m.) - Old Ger. 'judgment, council + army/host'; námo "judgment", namna "statute"; rimbe "host", thus Námorimbo or Namnarimbo
REGINA (f.) - Latin 'queen'; tári "queen", thus Tári itself
RENATO, RENÉE (m.) - from Latin 'born again'; *atanóna "born again/back", thus Atanóno
RENATA (f.) - feminine of RENATO (q.v.), thus Atanóne
REX (m.) - Latin 'king'; maybe *táru "king" (from tári "queen") for keeping similarity with REGINA (q.v.), thus Táru itself; or simply Aran
REYNARD (m.) - Old Ger. 'judgment, council + hard/strong'; námo "judgment", namna "statute"; tulca "strong", thus Námotulco or Namnatulco
RHODA (f.) - Greek 'rose'; losille "rose" (but it is from Qenya Lexicon - maybe invalid), thus Losille itself
RICHARD (m.) - Old Ger. 'ruler + hard/strong'; turo "ruler"; tulca "strong", thus Turotulco; another possibility is Old Ger. 'rich + hard', then alya "rich, prosperous", norna "stiff, tough, *hard', thus Alyanorno; this is already used
RICHENDA, RICHELLE (f.) - feminine of RICHARD (q.v.), thus Turetulce or Alyanorne
RITA (f.) - short for MARGARITA (q.v.), so Marille
ROBERT (m.) - Old Ger. 'fame + bright'; alcar "glory, splendour, brillance"; calima "bright", thus Alcarcalimo
ROBERTA, ROBINA (f.) - feminine form of ROBERT (q.v), thus Alcarcalime
SALVADOR (m.) - Spanish 'protector'; varya- "to protect", so Varyar
SAMSON (m.) - Heb. 'child of Sun'; Anar "Sun"; -ion "-son" thus Anarion or more probably Anárion
SAMUEL (m.) - maybe Heb. 'name of God'; Eru "God"; esse "name", thus Eruesso
SANDER (m.) - from Old Nor. 'protector'; *varno "protector", so Varno itself; or a short form of ALENXANDER (q.v.)
SARAH (f.) - Heb. 'princess'; aranel "princess", thus Aranel itself
SEBASTIEN (m.) - Latin 'from Sebastia' (from Greek 'venerable'); ar- "noble", enwina, yára "old", hence perhaps Arenwino or Aryáro (there is no word for "venerable" as far as I know)
SETH (m.) - Heb. 'appointed, placed'; caita- (from QL) "place", caitaina "placed", so Caitaino; or Heb. 'third child'; nelya "third", -hin "child", so Nelyahin or Nelyo ("the third one")
SIDNEY (m. & f.) - probably Old Eng. 'wide + island'; palla, landa "wide"; tol "island", thus maybe masc. Pallatol or Pallatollo, or Landatol(lo), and fem. Pallatolle, or Landatolle
SILVESTER (m.) - Latin 'woody, of wood'; taurina "of wood", thus Taurino
SILVESTRA (f.) - feminine form of SILVESTER (q.v.), thus Taurine
SILVIA (f.) - derivative of Latin 'wood'; taure "wood", thus could be Taurie
SIMEOM, SIMON (m.) - Heb. 'hearkening'; lasta "listening", thus could be Laston
SIMONA, SIMONE (f.) - feminine of SIMON (q.v.), thus Laste or Lastie
TARA (f.) - Gaelic 'hill'; ambo "hill", so Ambe; or it might be Sanskrit 'star'; elen, tinwe ("sparkle"), so Elen and Tinwewould work; Also, I was said that it means 'rocky pinnacle' (perhaps another translation of Gaelic original word); sarna "of stone", telma "topmost pinnacle", so Sarnatelme or Telmasarne (with a reverse word-order, which is not usual, though allowed)
TAYLOR (m. & f.) - Anglo-Norman 'cutter'; rista "cut", thus m. Ristar or Ristaro, and f. Ristare
THALIA (f.) - derived from Greek 'to flourish'; al- "to thrive", thus could be Alare ("she-thriver") or Alie or others
THELMA (f.) - from Greek '[act of] will'; nirme "act of will", thus Nirme itself
THEOBALD (m.) - Old Ger. 'people + bold'; lie "people"; verya, canya "bold", thus Lieveryo or Liecanyo
THEODORA (f.) - feminine of THEODORE (q.v.), thus Eruanne
THEODORE (m.) - Greek 'gift of God'; Eru "gift"; anna "gift", thus Eruanno
THERESA (f.) - very speculative, maybe derived from Greek 'to reap'; hosta "gather", thus maybe Hostie or Hostawen ("gathering-maiden") or Hostanis ("gathering-woman") or others; it also might be from Greek 'summer', so Laire (laire "summer")
THOMAS (m.) - Aramaic 'twin'; onóna "twin", thus could be Onóno
TIFFANY (f.) - Greek 'god + to appear'; Eru "God"; tana- "to show", thus Erutane or Erutanie
TOBIAS, TOBY (m.) - Heb. 'God [is] good'; Eru "God"; mára "good", thus Erumáro
TRAVIS (m.) - from Norman French 'he who crosses'; tara- "cross" (from QL, maybe not valid), thus Tarar
TREVOR (m.) - from Welsh 'big village'; alat- "large", opele "town, village", -os "city", so Alatopel or Alatos
TRISTAN (m.) - either from Celtic 'riot' or 'tumult'; since as far as I am aware there is no word or either of them, it is hard to translate this name, but perhaps *amortie "up-rising" might work, so Amortio or Amortion
WALTHEOF (m.) - Old English 'commander + wolf'; narmo "wolf"; cáno "commander", thus Narmocáno
WILHELMINA (f.) - feminine of WILLIAM (q.v), thus Níracas or Selmacas (-casse in declinations)
WILLIAM (m.) - Old Ger. 'will + helmet'; níra, selma "will"; cassa "helmet", thus Níracas or Selmacas (-casso in declinations), another possibility might be Mercas (with an element mer- "wish, desire, want"; this name is already used). -- In Sindarin Merthol (dôl "head")
WINSTON (m.) - Old Eng. 'joy + stone'; alasse "joy"; sar "stone", thus Alassar (Alassard-declinated)
[ X ]
XANTHE (f.) - Greek 'yellow'; malina "yellow", so Maline
XAVIER (f.) - perhaps Arabic 'bright'; calima "bright", so Calimo or Calimon; or perhaps Arabic 'new house'; vinya "new", car "house", so Vinyacardo or also Vincardo
XENIA (f.) - Greek 'stranger'; ara "outside", -lle fem. ending, so maybe Aralle (i.e. "girl from ouside, stranger")
[ Y ]
YANA, JANA (f.) - Slavic variant of JANE (q.v.), thus Eruantale or Eruntale
YAROSLAV, JAROSLAV (m.) - Slavic 'glorious by his bravery'; verie "boldness"; alcar "glory", thus Veralcar
YOLANDE (f.) - Greek 'violet flower'; helinille "violet" (from QL!), so Helinille by itself
YVES (m.) - Ger. 'yew'; tamuril "yew" (from QL, maybe no longer valid in LotR-style Quenya), so Tamurilo
YVETTE, YVONNE (f.) - feminine of YVES (q.v.), so Tamurile
[ Z ]
ZOE (f.) - Greek 'life'; cuile "life", so could be Cuile by itself; a variant of Quenya "life" could be coi (cf. coimas "life-bread"), so maybe Coiel (for ending -el see Altariel sc. Galadriel)