because originally in the original Zelda Online you had to quest for the Grails.

Weren't they called "graals"? I'm pretty sure the game is called "Graal" ;)
I go to www.graalonline.com
Never tried www.grailonline.com (EDIT: HOLY.....!!!!! IT WORKS!!! but I still see "Graal" written all over the site)
My client says "Graal", not "Grail"
Never seen anyone spell the game's name as Grail :p

The question is "how do you pronounce Graal", rather than "How do you translate Graal?"

Go to any translator and translate from English to French, Grail. The way to say grail in French is Graal. ;]

Okay, so "Grail" in french is "Graal"
We're making progress.

Now for the important part, how do you pronounce the "aa" in "Graal" when saying "Graal" in French?

Is it like English's A in "Angel", "fail", and "gingerale"?

Or is more like English's "A" and "O" in "Fall", "doll, and "ball"?

Or is it like how we say "bell", "tell", and "fell"?

I can't think of anything else that's possible.

My point is, no matter where you are or what language you're speaking "Graal" should only have 1-pronunciation. If it's French, it should be pronounced in it's French pronunciation even if you're speaking English UNLESS it is renamed/translated to Grail.

Does it matter? If the game was named Grail it would be ***. Grawl would be ***. Graal, is pure win.