This is probably the best help I can give with the pronunciations for the names in the Warlord Trilogy. I took the names from all sorts of sources, many of them ancient Welsh, but then the first audio-book was recorded and I was besieged by e-mails and faxes from the producers wanting to know how to pronounce Gorfyddyd and Culhwch, and I began to wish I'd called them Fred or Charlie. A Welsh-speaking friend dealt with the pronunciation enquiries, for which I am very grateful, and the list below is, to the best of my recollection, what was recommended. Not every name here is Welsh - some, like Aelle or Cerdic, are Saxon. I've only included the ones that seem to give the most difficulty and I have not attempted to cast them in any recognisable phonetic alphabet, and if any Welsh readers are mightily offended then please write and correct us!
Aelle - Ay (rhyme with bay) - ella
Ailleann - Eileen
Bleiddig - Blethig
Broceliande - Brossell-ee-ander
Caddwyg - Cathig
Cei - Kay
Ceinwyn - Kine-win
Cerdic - Serdic
Culhwch - Cull-hooch (guttural, as in Scottish loch)
Cuneglas - Cooner-Glass
Cyllan - Killen
Cythryn - Kith-rin
Cywyllog - Coo-ee-thlog
Dafydd ap Gruffud - Davv-id ap Gruffuth
Derfel - Der-vel
Diwrnach - Deer-nack
Erce - Err-chay
Gereint - Gerr-aint
Gofannon - Go - vannen
Gorfyddyd - Gor-vithid
Gwenhywach - Gwenn-high-arc (guttural)
Gwlyddyn - Gulithin
Gwynnedd - Gwinnith
Halcwum - Hal-coom
Helledd - Helleth
Hywel - Hugh-ell
Llywarch - Thly-warch
Lwellwyn - Thluellen
Lyonesse - Lee-on-ess
Manawydan - Manna-vidden
Oengus Mac Airem - Oingus Mac Air-em
Ui Liathain - Oo-ee Lith-ain