The ease with which I can confuse a fellow english speaker by saying my name is "Yves with a Q" alone I'm sure does it.

Personally, I'd just assume that meant your name was spelled "Yvesq" (or possibly "Yveq"), which, given my understanding of French phonetics would probably be pronounced exactly the same as "Yves", since q is widely regarded as a consonant, and it has been my observation that consonants on the end of a word in French generally don't appear to have much if anything to do with the pronunciation. Indeed, I'd expect "Yvesailles" to be pronounced the same way as well.

But, of course, I don't actually speak French, so maybe I'm just a confused English-speaker.