| Given Name and Variants | Diminutives | English Form |
| Andras | Andrew | |
| Dafydd | Dewi, Dai Dewydd, Daff, Taff, Taph, Taffy, Deykin, Deyo, Dio | David |
| Deiniol, Deinol | Daniel | |
| Iaco, Iago, Iagov, Yago, Yagov | James/Jacob | |
| Ieuan, Ievan, Iowan, Evan, Efan, Euan, Iefan, Ifan, Iwan, Siôn, Sionym, Yevan | John | |
| Iockin, Iockyn, Iocyn | Jock? | |
| Meical | Meic | Michael |
| Mihangel, Wasmihangel | Michael the Archangel | |
| Pedr | Peter | |
| Sawel, Sawyl, Safwyl | Samuel | |
| Siencyn, Jenn | Jenkin (John) | |
| Steffan | Stephan | |
| Tomos | Thomas | |
| Wasdewy, Gwasdewi | 'Follower of David?' |
| Madlen | Magdalen | |
| Mair, Meir, Mari | Mary | |
| Sian, Siani, Shanee, Sarn, Shan, Sioned | Jane | |
| Swisan | Susan |
This collection of names was compiled by Kate Monk and is ©1997, Kate Monk.
Copies may be made for personal use only.