I think
Remi is quite unisex these days, but I would still assume boy (in Australia) until proven otherwise. I love
Remiel! I have been thinking about it again recently :) I don't think it would be mispronounced that often, after all there is
Gabriel etc. I also think
Remi as a stand alone is just fine strangely enough.
Remy looks odd to me. It fits perfectly in with the sibset!