O lee veer (or YVAY) - pretty much how the site says, I think I prefer O lee veer a little more.It's nice, but I think it's too close to Oliver - everyone would think you were just misspelling it and pn it Oliver. That's my opinion
I like it but it's very French. I would pronounce it the French way Oh-lee-vee-eh. Traditional names such as Alexander, John, Charles etc would go well with Olivier in my opinion and also French names if you want to keep the French feel.