Never let it be said that your job is "thankless"... Kill me now.
Er, thanks for the Thanks!
Haha, on the contrary, you're very close! I think it's best described as "ree-YE-vaan", like the "ye" in Yezhov or Yeltsin. But I definitely like the "yay" part in your pronounciation.
Out of curiosity, how is your username pronounced? I imagine it being something like "ree-YAY-vaan" but I also imagine that what I just imagined is disgustingly wrong.