Bore da pawb,
I!ve noted some Welsh used in the books
Merlin Athrawes
Dialydd Mab
Nimue Alban
Nimue Chwaeriau
Athrawes is the feminine form of teacher, appropriate given although Merlin appears male, Nimue is a woman. Dialydd Mab can translate as avenging son and Yr Alban is Welsh for Scotland. Finally chwaer is sister in Welsh. This could give:
Merlin the teacher
Avenging son
Nimue the Scot and
Nimue's sister
Are there any more I've missed?
Diolch yn fawr iawn
Iorwerth