| Adda | Adam |
| Aleisandr | Alexander |
| Andrew | Andrew |
| Anna | Anna |
| Antoin | Antony |
| Arienrhod | Silver Wheel (f) |
| Arthur | Arthur |
| Awstin | Augustine, Austin |
| Bartholemew | Bartholemew |
| Buddeg | Boudicea, Victoria |
| Cadag | Cadog |
| Caradag | Caradog |
| Caraethag | Caractacus |
| Carol | Charles |
| Caroleth | Charlotte |
| Catren | Catherine |
| Cefin | Kevin |
| Cristen | Christina |
| Cristian | Christian |
| Cristoffer | Christopher |
| Costenhin | Constantine |
| Cynedd | Kenneth |
| Dewidd | David |
| Drystin | Tristan |
| Dunad | Donatus |
| Edwardd | Edward |
| Elen | Helen |
| Elisabeth | Elizabeth |
| Emreis | Ambrose |
| Enrhig | Henry |
| Erchyl | Hercules |
| Ffrencisc | Frank |
| Garfan | German |
| Geory | George |
| Gereint | Gereint, Gerontius |
| Gian | Jane |
| Gianeth | Janet |
| Gion, Iewan, Ioan, Efan | John |
| Gioffri | Geoffry |
| Girallt | Gerald |
| Gregor | Gregory |
| Greid | Grace |
| Griffydd | Griffith |
| Gwallter | Walter |
| Gwalwan | Gawain |
| Gwilim | William |
| Gwrthiern | Vortigern |
| Hyw | Hugh, Hugo |
| Iago, Iagom | James, Jacob |
| Ieroni | Jerome, Hieronymus |
| Iogos | Joyce |
| Iosep | Joseph |
| Iseullt | Isold |
| Keswallon | Caswallon, Casivallaunus |
| Llawreint | Laurance |
| Luc | Luke |
| Lluid | Lloyd |
| Madag | Madog |
| Maelcun | Maelcwn |
| Mair, Mari | Mary |
| Mallt | Maud, Matilda |
| Marc | Mark |
| Maryared | Margaret |
| Mathew | Matthew |
| Merddin | Merlin |
| Merthin | Martin |
| Mewrig | Maurice |
| Migangel | Michael |
| Nigol | Nicholas |
| Padrig | Patrick |
| Pawl | Paul |
| Pedr | Peter |
| Philip | Philip |
| Rhaifun | Raymond |
| Rheinallt | Reginald |
| Rhigardd | Richard |
| Rhoberth | Robert |
| Rhoddyrch | Roderick |
| Sarra | Sarah, Sally |
| Tegid | Tacitus |
| Timothew | Timothy |
| Tomos | Thomas |
| Ysteffan | Stephan |
| Ýstin | Justin |
Allt
Ban
Bech
Bel
Bendith
Blanc
Braw
Broch
Bryd
Bryn
Cab
Calw
Canyd
Car
Cel
Clig
Cybidd
Cynsie
Dere
Dysbellur
Ffeil
Ffeirth
Ffelig'
Fferreir
Ffrancis
Ffurneir
Glas
Glythun
Godwin
Gran
Gras
Griffin
Gris
Gwefer
Gwenadur
Gwithur
Harri
Hewlin
Iewen
Lladda
Llefan, Llewan
Llewein
Llîneir
Llewel
Lloneir
Llyddwig
Magr
Manuel
Meddig
Mendes
Molineir
Morgan
Muin
Nesc'
Nîr
Noc
Pascen
Pengras
Penrhys
Pereirin
Prefder
Rhedun
Rhoch
Rhui
Rhys
Saer
Saeson
Serw
Teg
Tew
Traffer
Uisel
Yddael
Yniwr