Dyffrig Parri is Terry Pratchett's Welsh-language Discworld translator. He is currently 48 years old and heads the [LfBCymru] translation company based in Cardiff. So far (2015) only one Discworld novel has been translated into Welsh: Thief of Time has been released as Lleidr Amser.
Wicipedia notes that two other non-Discworld books by TP are available in Welsh translation, in both cases trans. by Aled P. Jones;
- Joni a'r Meirwon (Johnny and the Dead)
- Dim Ond Ti All Achub y Ddynoliaeth (Only You Can Save Mankind)