Hi all
Thanks everyone for all your comments.  It was really interesting.  We are happy to know that Jack had no specific pronunciation for Aillas, AY-las sounds good, and was the way I read it in my head.  We have family in France and will be interesting to know how the French say the name (as the town), and will look into the Cornish pronunciation (as it is also a word from my home land).  So I think we'll eventually go with the most pleasing version.  Again - thanks to all for commenting so quickly, we really appreciate that.

best wishes
Bucket (Zakk's Aillas' dad)