well its hard to explain how we pronounce it in sweden, that sound is never heard in english, perhaps you know of the german "ü" as in über=) thats how the first letter "y" is pronouncedn then the "ng" is the same is in Ingvay, but the last "e" in Yngve is pronounced like a fast "eh" as in echo.
So it would look something like this if I would write it:
"üngveh"
bah...perhaps you get it.

I also wonder why he get so pissed about people calling him
"üngveh" instead of Ingvay. I guess it has something to do with the fact that he wants to leave everything about sweden behind...or something..=)