Отсканил страницу из словаря. o+, a+, y+ - буквы с крышкой. Для справки даны английские аналоги. Правила чтения см. на www.cymraeg.ru. От себя могу добавить Llywelyn, Rhodri, Hywel, Gwyn (мужское) и Gwen (женское).
Adda Adam
Anghrist Antichrist
Andreas Andrew
Awstin Augustine
Bartholomeus Bartholomew
Beda Bede
Bedwyr Bedivere
Beti, Betsan, Betsi Betty, Betsy
Buddug Boadicea; Victoria
Bwda Buddha
Cadi Catherine, Kate
Cadog, Catwg Cadoc
Cai Kay
Caradog Caratacos, Caractacus
Caswalfon Cassivellaunus
Catrin Catherine
Cesar Caesar
Crist Christ
Cystennin Constantine
Dafydd, Dewi David
Edmwnt, Emwnt Edmund
Efa Eve
Elen Helen, Ellen
Eleias Elijah, Elias
Eliseus Elisha, Eliseus
Emrys Ambrose
Ercwlff Hercules
Eseia, Esay Isaiah
Esyllt Iseult
Fychan Vaughan
Fyrsil, Fferyll Virgil
Ffowc Foulkes
Ffraid Bride. Bridget
Gannon Germanus
Geraint Gerontius
Geralft Gerald
Glyndwr Glendower
Gruffudd, Gruffydd Grifflth
Gwallter Walter
Gwener Venus
Gwenffrewi, Gwenfrewi Winifred
Gwenhwyfar Guinevere
Gwilym William
Gwladus Gladys
Gwrtheym Vortigern
Harri Harry. Henry
Horas Horace
Hors Horsa
Hu, Huw Hugh
Iago James
Iau Jove, Jupiter
Iesu Grist Jesus Christ
Ieuan Evan
Ioan John
Iorwerth Edward
Iwan John
Lowri Laura
Luc Luke
Lleucu Lucy
Llwyd LJoyd
Llyr Lear
Mabli Mabel
Mair Mary
Mali Molly
Mallt Maud, Matilda
Marc Mark
Marged, Margred Margaret
Mari Mary
Mawrth Mars
Mercher Mercury
Mererid Margaret
Meurig Morris
Mihangel Michael
Modlen, Magdalen Magdalene
Myrddin Merlin
Neifion Neptune
Ofydd Ovid
Oswallt Oswald
Owain Owen
Padrig Patrick
Pedr Peter
Peredur Perceval
Prys Price, Preece
Puw Pugh
Pyrs Pierce
Rheinallt Reginald
Rhisiart Richard
Rhobert Robert
Rhonwen Rowena
Rhydderch Roderick
Rhys Rees, Rice
Sadwm Saturn
Sebedeus Zebedee
Selyf Solomon
Sia+n Jane
Siarl Charles
Siartymaen Charlemagne
Sieffre Geoffrey
Siencyn Jenkin
Sio+n John
Sioned Janet
Sio+r, Siors George
Steffan Stephen
Timotheus Timothy
Tomos Thomas
Tudur Tudor
Twm Tom
Wmffre Humphrey