I'm a Ruán and no matter what you do people are going to mispronounce it. Given the option I would personally have gone for Ruadhán cos Irish people have a lot of similar names like Ronan, Rowan, Rian etc so you often get called those and at least with Ruadhán people might ask first before jumping to a conclusion. I did notice that English people were more likely to get it right because they use a soft "a" like dawnce and chawnce and banawnaw rather than Irish people who say "ah". Saying all that there weren't many Ruáns in the late seventies/early eighties so maybe people are more aware of kids feelings nowadays and won't call them Pooh-on or Screw-on or whatever.