@cerenium The usage of ao is extremely rare in the english langauge.(google pronounces raon as rayon), thus uncomforatble to read, most will read it as rayon or as roan.
If you are are going for ou, then just use ou, Roun. Or Rowun, or Rowan
Listening to the korean pronounciation, it sounds more like an L than an R though. Like lown
Again, Raon is hard to read for native english speakers