To the best of my knowledge, if you're asking how this name should be prounounced as well as what it means, the way it should be prounounced is as follows:
Ray-eesa
At least that is how I would pronounce it if I met a Japanese person with that name (I haven't actually met someone with that name yet ^_~" ) But I do have a friend called
Rei and you pronounce that as
Ray.