I've been going "ay-oy" personally even though it doesn't sound quite right, but I have no idea and am terrible with those sorts of names. "ow-ee" doesn't sound or feel right to me even if it looks right for the name, and "oy" is in the same boat.
I'm sure it'll end up I'm overthinking it, like with another game, a girl named Qiya I was pronouncing "kee-ya" and it turned out to be "kai-ya".